How does SEO work?

Last updated: 1 August 2026

SEO works by helping Google find, understand and assess the pages on your website, so it can show the most relevant one when somebody searches for what you offer. You cannot tell Google where to rank a page, but you can improve its chances by making your website easy to crawl, matching the page to what people are searching for and providing a useful answer.

This guide explains how that process works in practical terms. It is written for small businesses and marketers in Ireland who want to understand what SEO actually involves, from crawling and indexing to content, links and technical improvements. It will also help you understand what you can control, what Google decides and why more traffic does not always mean better results.

What does SEO actually do?

SEO helps the right pages on your website appear in unpaid search results when people look for the products, services or information you provide.

For example, a Dublin accountant may want a service page to appear when somebody searches for help with company tax, while an ecommerce business may want a product category to appear when somebody searches for a particular type of item. SEO connects those searches with the page that best answers them.

Unlike Google Ads, you do not pay each time somebody clicks an organic result. However, that does not make SEO free. Research, content, technical improvements, website changes and link building all require time, expertise or budget.

SEO also does not simply make an entire website rank higher. Google assesses individual pages for individual searches. One page may perform well for a valuable service while another receives little visibility because it is too vague, competes with another page on the same website or does not satisfy what the searcher needs.

The objective is not to attract as many visitors as possible. It is to make your business visible for relevant searches and turn that visibility into enquiries, bookings, sales or another useful outcome.

How does Google Search work?

Before a page can appear in Google, it needs to be discovered, processed and selected for a relevant search. Google describes this as three stages: crawling, indexing and serving search results. A page can pass through one stage without making it through the next, so being discovered does not guarantee that it will be indexed or shown.

Crawling: how Google discovers pages

Google uses automated programs known as crawlers to find new and updated pages. These crawlers follow links between pages, revisit websites they already know about and use information from sources such as an XML sitemap.

This is one reason internal linking matters. When an important service page is linked clearly from your navigation and other relevant pages, Google has an easier route to find it. A page that is hidden deep within the site, has no internal links or requires somebody to log in may be much harder to discover.

Finding a URL does not mean Google will crawl it immediately or at all. Server problems, incorrect robots.txt rules and other technical SEO issues can prevent Google from accessing the page properly.

Indexing: how Google understands and stores pages

After crawling a page, Google analyses its content and structure to work out what it is about. This can include the page title, headings, written copy, images, videos and links.

Google may then store information about the page in its index, which is the database it searches when somebody enters a query. However, indexing is not automatic. Google may decide not to index a page when the content is very similar to another page, offers little useful information or has been marked with instructions that prevent indexing.

When Google finds several similar versions of a page, it may select one as the canonical version and treat the others as alternatives. This is why duplicate service pages, copied content and inconsistent URLs can create problems. Google may not choose the version you intended.

Serving and ranking: how Google selects results

When somebody searches, Google looks through its index for pages that match the query. Its automated ranking systems then assess which results are likely to be the most relevant and useful.

Google’s systems work mainly at page level. This means one page on your website may rank well while another does not. A strong website does not automatically make every page competitive, and one weak page does not necessarily prevent the rest of the site from performing.

The results can also vary according to the search itself and the person making it. Location, language and device can all affect what Google shows. Somebody searching for an accountant in Dublin may therefore see different results from somebody using the same words elsewhere in Ireland.

Ranking is not a fixed position that a page earns permanently. Google reassesses pages and competing results as content, websites and searches change. SEO improves the signals Google can use, but Google still decides whether a page is relevant enough to appear and where it should be placed.

How does SEO influence that process?

SEO does not change how Google works. It improves the information and signals Google can use when deciding whether a page should be crawled, indexed and shown for a particular search.

That work is often divided into three areas: technical SEO, on-page SEO and off-page SEO. They are closely connected. A useful page cannot perform if Google cannot access it, while a technically sound website will still struggle if its content is vague or nobody else considers it worth referencing.

Technical SEO makes pages accessible

Technical SEO covers the parts of your website that affect whether search engines can access, process and index its pages properly.

This includes:

• Crawl and indexing settings

• Site structure and internal navigation

• XML sitemaps

• Redirects and broken links

• Mobile usability

• Page speed and website performance

• HTTPS and website security

• Duplicate URLs and canonical tags

• Structured data

Some technical problems affect one page. Others can restrict an entire section or website. A noindex instruction applied to the wrong template, for example, could prevent every service page using that template from appearing in Google.

The same applies after a redesign or migration. Pages may disappear because URLs changed without suitable redirects, internal links still point to old addresses or important content was removed during the rebuild. This is why a website that looks better to the business can perform worse in search.

Technical SEO is not about achieving a perfect score in an audit tool. It is about removing obstacles that prevent Google and potential customers from using the website properly. On a small Irish business site, fixing a few important crawl, indexing or mobile issues may matter far more than correcting dozens of minor warnings.

On-page SEO makes pages understandable and relevant

On-page SEO covers the content and elements within each page. Its purpose is to make the page’s subject, audience and value clear to both the searcher and Google.

This includes:

• The page title and main heading

• Supporting headings

• The written content

• Images and alternative text

• The URL

• Meta descriptions

• Internal links

• The way information is organised

Keywords are part of this work, but adding a target phrase to the title and repeating it several times is not enough. The page still needs to satisfy the reason behind the search.

For example, somebody searching for “emergency plumber Dublin” is likely to want a plumber who serves their area, can respond quickly and explains how to make contact. A general page about the history of the plumbing business would not satisfy that need, even if it used the phrase in several headings.

Good keyword research helps identify what people search for, but the more important decision is which page should answer each search. When several articles or service pages target the same query, they can compete with each other and leave Google unsure which one is the best result.

This is a problem I often find when reviewing websites. The business has created more content, but not more clarity. Several pages cover almost the same topic, while commercially important services receive only a few vague paragraphs.

On-page SEO therefore includes deciding what not to publish, which pages should be combined and where one page should link to another instead of repeating its content. The aim is not to mention every related term. It is to give each page a clear purpose.

Off-page SEO supports reputation and authority

Off-site SEO covers relevant signals that come from outside your own website. The best-known example is a backlink, which is a link from another website to one of your pages.

Links can help Google discover pages, but they can also indicate that other websites consider the content or business worth referencing. A link from a respected industry body, local newspaper, supplier or relevant publication can support the credibility of a page.

Not every link has the same value. Hundreds of links from unrelated directories or low-quality websites are not more useful than a smaller number of genuine, relevant references. Buying cheap links or joining automated link schemes can also create unnecessary risk.

Off-page SEO can also include business mentions, local citations, reviews and public information that helps establish who the business is and where it operates. These signals are particularly relevant to local businesses, although they do not replace the need for a useful website and accurate Google Business Profile.

A Dublin solicitor may benefit from being referenced by a professional organisation or Irish business publication. A local tradesperson may gain more value from links and mentions connected to the areas they serve. The right opportunities depend on the business, market and pages you are trying to strengthen.

Technical, on-page and off-page SEO work best when they support the same page and objective. Making a page faster will not solve a poor match with the search intent. Rewriting the content will not help if the page is blocked from indexing. Building links to a weak or irrelevant page may increase its authority without making it useful.

SEO works by identifying which part of that chain is limiting the page, then improving it in the right order.

How does SEO work in practice?

In practice, SEO is not a collection of isolated fixes. It is a process of deciding which searches matter to the business, which pages should appear for them and what is preventing those pages from performing.

The precise work will vary from one website to another, but a sensible process follows the same basic order.

1. Define what the business needs SEO to achieve

The starting point should be a commercial objective, not a list of keywords.

A local service business may want more calls or enquiries from a particular area. An ecommerce website may want to increase sales from specific product categories. A professional firm may need better visibility for a small number of high-value services.

This matters because more organic traffic is not always useful. A Dublin accountant could attract thousands of visitors to a general article about tax without receiving a single relevant enquiry. The SEO objective should determine which searches and pages deserve attention.

2. Research what potential customers are searching for

The next step is to understand how people describe the product, service or problem when they search.

This involves looking at:

• The words and questions people use

• The number of searches available

• The intent behind each query

• The types of pages already appearing

• The strength of competing websites

• Whether the search is local, national or informational

Search volume alone should not decide the priority. In Ireland, a highly specific term may receive relatively few searches but still be valuable if those searchers are likely to become customers.

3. Decide which page should answer each search

Each important search topic should have a clear destination on the website.

A service-related search should normally lead to a relevant service page. A question may be better answered by an article. A local search may require a location page or a properly optimised Google Business Profile.

This is where many websites become confused. Several pages may cover the same topic, while none provides a complete answer. Google then has to choose between similar pages, and the business ends up competing with itself.

Part of a good SEO strategy is deciding which page should be strengthened, which pages should be combined and which topics deserve their own content.

4. Identify the problems holding those pages back

An SEO audit helps identify why important pages are not performing as well as they could.

The issue may be technical, such as a page that cannot be indexed. It may be related to content, such as a service page that does not explain the service properly. It may also be a lack of authority, poor internal linking or competition from another page on the same website.

Not every warning in an audit deserves the same attention. The priority should be the problems affecting important pages and commercially relevant searches, not the number of errors displayed by a tool.

5. Improve or create the required pages

Once the priorities are clear, the relevant pages can be improved.

The work may include:

• Rewriting vague or incomplete content

• Improving titles and headings

• Matching the page more closely to the search intent

• Adding useful internal links

• Combining overlapping pages

• Creating a new page where a genuine gap exists

• Improving the next step for the visitor

The objective is not to make every page longer. A page needs enough information to satisfy the searcher and support the business decision they are trying to make.

6. Strengthen the website’s authority

Some pages can improve through technical and on-page changes alone. More competitive searches may also require stronger external signals.

This can involve earning relevant links, improving local citations, gaining genuine reviews, contributing useful expertise to other publications or creating content that people have a reason to reference.

Link building should support pages that already deserve to rank. Sending links to weak, duplicated or poorly targeted content does not resolve the underlying problem.

7. Measure the results and refine the work

SEO needs to be reviewed after changes have been made. Search engines need time to recrawl pages, reassess their content and compare them with competing results.

The data can then show:

• Whether pages are being indexed

• Whether search visibility is increasing

• Which queries are producing impressions and clicks

• Whether the right landing pages are attracting traffic

• Whether that traffic generates enquiries, bookings or sales

• Where further work is needed

The process is repeated based on what the evidence shows. A page that gains visibility but produces no useful action may need a better offer or clearer next step. A page that converts well but receives little traffic may deserve more content, internal links or authority.

For a small business, doing SEO for a website step by step means starting with a limited number of important pages rather than trying to optimise the entire website at once. 

How keyword research connects customers with pages

Keyword research helps you understand what potential customers search for and what they expect to find when they use those words.

The purpose is not to collect a long list of popular phrases and add them throughout your website. It is to identify genuine demand, understand the intent behind each search and decide which page should meet that need.

For example, searches for “accountant Dublin”, “small business accountant Dublin” and “accountant for startups” are related, but they may not all require separate pages. If the searcher is looking for the same service, one strong page may be able to cover those variations naturally.

By contrast, somebody searching “how much does an accountant cost?” is asking for information rather than choosing a provider immediately. That query may be better answered by an article, which can then link naturally to the relevant service page.

This distinction matters because creating a new page for every keyword often leads to thin or overlapping content. Several pages end up competing for the same searches, while Google has no clear reason to favour one over another.

A more useful approach is to group related searches by intent and assign each group to the most suitable page. Service searches belong on service pages, product searches on category or product pages, and detailed questions on articles or guides.

Search volume also needs context. A broad term may attract more searches but be highly competitive or poorly matched to the business. A more specific search may have lower volume but describe exactly the service, product or location you want to target.

This is particularly relevant in Ireland, where search volumes can be modest. A Dublin consultant or specialist service provider may only need a small number of relevant searches to produce worthwhile enquiries. Chasing the highest-volume keywords can distract from the smaller opportunities that are more likely to generate business.

Keywords help you understand how customers describe their needs. SEO works when that insight leads to the right page, the right content and a clear next step, not when the same phrase is repeated as often as possible.

Final thoughts

SEO works by improving the chances that the right page will be found, understood and selected for a relevant search. That means removing technical barriers, matching each page to a clear search need, creating useful content and building enough trust and authority to compete.

For a small Irish business, the goal is not to rank for as many keywords as possible. It is to become visible for the searches most likely to lead to an enquiry, booking or sale.

The strongest SEO work is usually focused. It starts with the pages that matter most, fixes the problems holding them back and measures whether the resulting traffic is commercially useful. It also accepts that Google controls the final result. SEO can improve your chances, but it cannot guarantee a position.

A clear strategy, realistic priorities and regular review will take you further than publishing more pages or chasing every new tactic.

FAQs about how SEO works

Can I do SEO myself?

Yes. A small business owner can handle basic SEO tasks such as improving page titles, clarifying service pages, adding internal links and checking whether important pages are indexed.

The challenge is knowing what to prioritise. SEO can involve content, website structure, analytics, technical settings and links, so doing SEO yourself becomes more difficult as the website or market grows.

Is SEO free?

You do not pay Google each time somebody clicks an organic result, but SEO still requires time, tools, content, technical work or professional support.

The cost of SEO depends on the condition of the website, the level of competition and how much work is needed to reach the business objective.

Does every page need SEO?

Every important page should have a clear purpose and be easy for search engines and visitors to understand. However, not every page needs to target a separate keyword.

Some pages exist for customers who already know the business, such as contact, privacy or account pages. SEO effort should focus first on the service, product, category and informational pages that can attract relevant searches.

Does SEO work for small businesses?

SEO can work for small businesses when potential customers search for what they offer and the business can compete for those searches at a sensible cost.

A small Irish business does not need thousands of visitors to benefit. A limited number of relevant searches can be valuable when the service has a strong commercial value and the website converts those visitors into customers.

How often should SEO be reviewed?

SEO should be reviewed regularly, but not every change needs daily attention. Important pages, search performance, conversions and technical health should be checked often enough to identify sustained problems or opportunities.

A more detailed SEO audit is useful after a redesign, migration, major traffic drop or significant change to the business, as well as at planned intervals for larger websites.

Need help making SEO work for your business?

Understanding how SEO works is useful, but the real challenge is deciding what your website needs and which changes deserve attention first.

I help small businesses in Dublin and across Ireland identify the pages, technical issues and search opportunities most likely to affect their visibility and enquiries. Depending on the site, this may involve an SEO audit, content improvements, technical fixes or a more focused search strategy.

You work directly with me throughout the process. I will explain what is holding the website back, what should be prioritised and where SEO may not be the right first investment.

Learn more about working with an SEO consultant in Dublin or book a free consultation to discuss your website and goals.