How does SEO work, and how does it relate to search engines?

SEO (search engine optimization) is the work of getting a site to show up in Google's results when someone searches for what that site offers. To understand how it works, it helps to understand how a search engine works first, because every part of SEO responds to one of its stages.

The three stages of a search engine

1. Crawling: finding pages

Google uses automated programs (crawlers) that move around the web following links. That's how they discover new pages and revisit known ones to see what changed. If a page gets no links or is blocked, Google may never find it.

What you can do: link your important pages from the menu and from other pages, have a sitemap, and make sure you're not accidentally blocking what you want to show.

2. Indexing: understanding and storing

When Google finds a page, it analyzes it: the text, headings, images and structured data. If it considers it useful and not a duplicate, it stores it in its index, the huge database results come from. A page that isn't in the index can't appear in any search.

What you can do: one page per topic, with a clear title; avoid near-identical pages; check in Google Search Console which pages are indexed, which aren't and why. See how to use Google Search Console.

3. Ranking: ordering the results

When someone searches, Google picks the pages from its index that best answer the query and puts them in order. It weighs hundreds of signals, which boil down to a few ideas:

• Relevance: whether the page answers what the person wants to know or do.
• Quality and expertise: whether the content is useful, trustworthy and shows real knowledge.
• Authority: whether other trustworthy sites mention or link to it.
• Page experience: whether the page loads fast, works well on mobile and is secure.
• Context: the searcher's location, language and device. That's why results for "dentist" are different in Liberia and in Cartago.

The pillars of SEO

Each stage translates into an area of work:

Technical SEO

Makes sure Google can crawl and index the site without obstacles: speed, mobile version, HTTPS, redirects, structured data. More in our technical SEO guide.

Content and keywords

Keywords are the phrases people type into Google. The work is understanding what your customers search for and in which words (in Costa Rica, sometimes very local ones: see Costa Rican Spanish words) and creating pages that answer better than the rest.

Repeating a word many times doesn't help, and can hurt. What works is covering the topic well, in natural language.

Authority and links

Links from other sites work like recommendations. Quality and relevance to your topic matter more than quantity. For local businesses, local links and mentions are especially valuable.

Local SEO

For businesses that serve an area, Google also shows a map with nearby businesses. That result depends mostly on your Google Business Profile and your reviews.

How it's measured

SEO is measured with free tools:

• Google Search Console: which searches you appear for, how often, in what position and how many clicks you get; which pages are indexed.
• Google Analytics: what people do when they reach your site and how many end up making an enquiry or a purchase.

The metric that matters most isn't position, but how many people arrive from Google and become customers. More in how to measure SEO results.

How long it takes

SEO isn't instant. Google needs to recrawl improved pages, and new content gains visibility over time. Technical and local improvements can show within weeks; growth in competitive searches usually takes months. That's why it's best seen as an ongoing investment, not a campaign.

Frequently asked questions

Is SEO the same as Google Ads?

No. Google Ads are advertising: you pay for every click and visibility stops when you stop paying. SEO works on organic results, which aren't paid per click.

Does Google change its rules a lot?

Google updates its algorithm frequently, but the principle doesn't change: show the most useful, trustworthy answer. Sites built for users rather than to trick the search engine tend to weather those changes well.

Can you pay Google to rank first in organic results?

No. Organic results aren't for sale. Be wary of anyone who guarantees first place.

Next step

To see how your site is doing at each of these stages, an SEO audit shows you, with clear priorities. You can also talk to us.