What is SEO and how does it work?

What is SEO?

SEO, short for search engine optimization, is the practice of improving a website so that search engines like Google and Bing can find its pages, understand what they are about, and show them in the unpaid ("organic") results for relevant searches. Google's own SEO Starter Guide describes it as helping search engines understand your content and helping people find your site and decide whether to visit it.

That second half matters. SEO is not only about pleasing an algorithm. A result has to earn the click: the title and snippet need to tell a searcher that this page has what they want, and the page has to deliver it. Most good SEO is ordinary good website practice, done deliberately.

A quick example. A bakery in Halifax wants to be found for "custom birthday cakes Halifax". SEO for that bakery means making sure Google can reach the cake page, that the page clearly says what cakes it makes, where, at what prices and how to order, and that local sites and directories mention the bakery. None of it involves paying Google.

How does SEO work?

SEO works by helping your pages pass the three stages every search engine uses: crawling (a bot fetches the page), indexing (the engine stores and understands it) and serving (it picks the most relevant, useful pages for each search). Google's guide to how Google Search works notes that not every page makes it through each stage.

1. Crawling

   Google's crawler, Googlebot, discovers pages by following links from pages it already knows and by reading sitemaps you submit. If no links point to a page, or robots.txt blocks it, it may never be fetched.

2. Indexing

   Google analyses the text, title, images and other elements, groups duplicate pages together and picks one version (the canonical) to show. Indexing is not guaranteed; Google says not every page it processes is indexed.

3. Serving (ranking)

   When someone searches, Google looks for matching pages in its index and returns the ones it judges most relevant and highest quality, using hundreds of factors, including the searcher's location, language and device.

SEO is making each stage easy: be reachable, be understandable, be the best answer. For the mechanics in more depth, including what goes wrong at each stage and how to check, read our companion guide How do search engines work?

What are the three pillars of SEO?

The three pillars are technical SEO (search engines can crawl and index the site), on-page and content SEO (each page clearly answers a search better than the alternatives), and authority (other sites link to and talk about you). The names are an industry convention, not an official Google list, but they map neatly onto the three stages above and onto what both Google and Microsoft describe in their guidelines.

Pillar 1: technical SEO

Technical SEO is the plumbing. Google's Search Essentials say very few technical steps are needed and that most sites meet them without realising it. Problems usually come from a well-meaning setting: a "discourage search engines" box left ticked after a redesign, a security plugin or firewall that blocks bots, or old pages that now return errors. Google's how-search-works guide names server problems, network issues and robots.txt rules as common reasons a page is not crawled. Our SEO audit guide walks through the checks in priority order.

Pillar 2: on-page and content SEO

This is the pillar most owners can improve themselves. Google's starter guide asks for content that is easy to read, well organised, unique and up to date, written in the words your customers actually use. It also says Google builds the title link from the <title> element and headings, and usually draws the snippet from the page text. In practice: one page per service or product, a title that says what it is, the answer near the top, and real details (prices, areas served, photos, how to order). Our on-page SEO checklist covers each element.

Pillar 3: authority, links and mentions

Links are how search engines discover pages and one of the signals they use to judge them. Google's starter guide calls links a major way it finds new pages. Microsoft's Bing Webmaster Guidelines say strong internal and external linking supports discovery and authority evaluation, and list link buying, link spamming and private networks as abuse. The honest way to earn links is to be worth linking to: suppliers, local associations, press, partners and customers mentioning you. For what "authority" scores do and do not mean, see What is domain authority?

How is SEO different from paid search ads?

Paid search ads put you at the top of results for as long as you keep paying; SEO earns unpaid listings that keep sending visits without a per-click cost, but takes longer and cannot be bought. Google is explicit in Do you need an SEO?: advertising with Google won't have any effect on your site's presence in its search results, and it never accepts money to include or rank sites.

They are not rivals. Many small businesses run a small ad budget for their most valuable searches while SEO builds up, and use the ad data to learn which searches turn into customers.

How long does SEO take to work?

There is no fixed answer, and Google does not give one: its starter guide says some changes might take effect in a few hours while others could take several months, and suggests waiting a few weeks before judging whether a change worked. Anyone who promises a specific ranking by a specific date is guessing, or worse.

Google's Do you need an SEO? page is blunt about this. It says no one can guarantee a #1 ranking on Google, and that if someone promises one you should find someone else. Instead of a deadline, it suggests asking any SEO you hire what results they expect to see, in what timeframe, and how they will measure success.

What makes the wait shorter or longer, in practice:

• Removing a block can be quick. If a noindex tag or robots.txt rule was hiding the site, results can return once Google recrawls the pages.
• A brand-new site is slow. Google has to discover it, crawl it and learn about it, and few links point to it yet.
• Competitive searches are slow. "Plumber" in a large city has many established competitors; "emergency plumber for heritage homes in Kitsilano" has far fewer.
• Data lags behind changes. Search Console figures arrive after a delay, so a change made on Monday cannot be judged on Tuesday.

What does Google say you can ignore?

Google's starter guide lists several popular ideas that do little or nothing for ranking: the keywords meta tag, keyword stuffing, keywords in the domain name, hitting a word count, and the number or order of headings. Knowing them saves beginners a lot of wasted effort.

• Meta keywords: Google says it doesn't use the keywords meta tag.
• Keyword stuffing: repeating words is tiring to read and against Google's spam policies.
• Keyword domains: keywords in a domain name have hardly any effect beyond appearing in breadcrumbs. Pick a name that suits your business.
• Content length: there is no ideal word count. Length alone does not affect ranking.
• Duplicate content "penalty": the same content at two URLs on your own site is inefficient, not penalised. Copying other people's content is a different matter.
• E-E-A-T as a score: the guide says experience, expertise, authoritativeness and trust are not a ranking factor in themselves.

What should you do in your first week of SEO?

Spend the first week measuring before changing much: connect Google Search Console and Bing Webmaster Tools, confirm your important pages are indexed, see which searches already find you, then fix the one or two biggest problems. Everything below can be done with free tools.

1. Day 1: set up Google Search Console

   Add and verify your site in Search Console. It is free and it is Google's own data about your site: which searches show it, how often people click, which pages are indexed and why others are not. Submit your XML sitemap (most website builders create one automatically).

2. Day 2: add Bing Webmaster Tools

   Bing lets you import a verified site from Search Console. Microsoft's guidelines say Bing's index also feeds Copilot and grounding results, so it is worth five minutes. Our Bing Webmaster Tools guide has the steps.

3. Day 3: check indexing

   Open Indexing, then Pages, in Search Console. Do not panic at the "not indexed" count; Google says not to expect every URL on a site to be indexed. Instead, run URL Inspection on your homepage and your three most important service or product pages. Each should report that the URL is on Google. If one does not, that is your first fix.

4. Day 4: see what you already rank for

   Open Performance, then Search results, sort queries by impressions, and look for searches where you appear but get few clicks. They are often a better title or a better page away from more visits. Our guide to Search Console average position explains what the position column really means.

5. Day 5: improve one page

   Pick your most important page. Make its title say what it offers and where, answer the main question in the first paragraph, add the details a customer needs, and link to it from your homepage. Write for a person, not a keyword count.

6. Days 6 and 7: record a baseline and run an audit

   Write down where you are today: clicks, impressions and average position for your ten most important searches. Then crawl the site for broken links, missing titles and noindex mistakes. You can do both by hand, or with MrKeyword's Free plan as below.

Where does MrKeyword fit for a beginner?

MrKeyword turns the free data from Search Console and Bing Webmaster Tools into a saved, tracked history and adds a site audit, so a beginner can see trends and problems in one place without paying for a large SEO suite. It suits small businesses and solo site owners who want their own numbers explained rather than a database of other people's.

• Free ($0): 1 website, 1 seat, 25 tracked keywords, site audits up to 100 pages a month, and AI search visibility for 3 questions a week. No AI audits or briefs.
• Paid plans: Starter is $10/month for 1 website and adds AI audits and briefs; Growth is $19/month for 3 websites; Agency is $49/month for 10. Each is also sold yearly at ten times the monthly price. Exact limits are on the pricing page.

Rank tracking uses the average positions Search Console and Bing report for your verified site and keeps a daily copy, and the Site Audit runs 68 technical SEO checks. To try single checks without signing up, use the free SEO tools; SEO tools for small business explains which plan fits which kind of business.

What MrKeyword does not do

MrKeyword does not do SEO for you, cannot guarantee rankings, and has neither a complete index of the web's backlinks nor measured traffic for sites you do not own. To be specific:

• No guaranteed results. No tool can make Google rank a page, and we do not promise a position or a date.
• Positions are Search Console averages, not live checks. They arrive with Google's delay and only cover searches where your site had impressions.
• Competitors are predicted, not measured. MrKeyword has no measured rank for a site you do not own; competitor figures are labelled Predicted or Not available.
• Backlinks are partial. MrKeyword only knows the links its own crawler has found, which is not the whole web.
• No AI audits on the Free plan. AI audits and briefs need a paid plan or a $5 credit pack.

Questions and answers