# Search engine A search engine crawls the web, builds its own index and answers queries with a ranked list and result features. For a small site, you optimise for the engines that send your audience and watch how your pages show up, get clicked and convert. Updated 2026-09-14 · Source: https://porteur.ai/glossary/search-engine ## What engines matter and where Google handles the large majority of searches in most countries. If you ship in English or globally, start there. Bing matters, and it also powers Microsoft Copilot, Yahoo and part of DuckDuckGo answers. If your users sit on Windows or Edge, include it. Yandex, Baidu, Naver and Seznam lead in their home markets. Target them when you serve users in those countries and languages. AI answer engines such as ChatGPT search and Perplexity retrieve from an index and write an answer with citations. They are not classic blue links, but they still need to find and trust your pages. ## How a search engine works Each engine runs its own crawler and builds its own index. Your page is discovered, rendered and stored separately by each one. - Crawl: a bot fetches URLs it knows about, follows links and sitemaps, and retrieves resources. - Index: the engine renders the page, extracts text, links, media and structured data, and stores them. - Rank and answer: for a query, it picks documents, orders them and shows results and features like sitelinks or images. AI answer engines also retrieve, then generate text that cites sources. Visibility there depends on being crawled, relevant and quotable. ## How to measure your presence Use Search Console for Google. It shows queries, pages, impressions, clicks and positions. It also reports crawling and indexation states. Use Bing Webmaster Tools for Bing. Check performance and coverage there as well. Treat each as a separate source of truth. - For a page like /pricing, watch impressions and clicks by query, for example “yourproduct pricing”. - Track search appearance, for example images or sitelinks, to see how your result renders. - Watch index coverage. Fix pages that are discovered but not indexed, or excluded by noindex. - Check branded and non branded queries in the last 28 days to see what people actually search. ## What to do on a small site - Get crawled: link every key page from your navigation, add an XML sitemap and avoid orphan pages. - Make pages clear: one topic per URL, a concise title under about 60 characters, and a meta description that matches the search intent. - Answer search intent: if the query is “pricing”, the /pricing page should load fast and show plans above the fold. - Ship technical basics: fast LCP under 2.5 seconds, stable CLS under 0.1, responsive layout and clean internal links. - Use structured data where it helps, for example FAQ on /guides/getting-started if you truly answer common questions. - For AI answer engines, write sentences that can be cited, name the thing clearly and provide sources or specs on the page. Submit your site to both consoles and verify ownership. Check crawl stats, coverage and performance monthly. Fix what blocks discovery first. ## Common traps - Thinking one index covers all. Each engine must find your page on its own. - Blocking bots you need. robots.txt rules that stop Googlebot or Bingbot will remove you from their indexes. - Thin pages. Ten weak posts on the same topic can split relevance and cause cannibalisation. - Slow image heavy layouts. If images drive your result, compress and lazy load or you lose clicks. - Ignoring AI answers. If your how to page is never cited, add clearer steps, facts and sourcing. > One rule: measure in the engine’s own console before trusting third party metrics. ## Questions ### What is a search engine? A search engine crawls the web, builds an index and answers queries with a ranked list and result features. Each engine, including AI answer engines, runs its own crawler and index. ### Which search engines should I optimise for? Start with Google in most countries. Add Bing, which also answers Microsoft Copilot, Yahoo and part of DuckDuckGo. Target Yandex, Baidu, Naver or Seznam when you serve users in those markets. ### Do I need to submit my site to every engine? You can be discovered by links alone, but submission speeds things up. Verify Search Console for Google and Bing Webmaster Tools for Bing. Follow their coverage reports and fix crawl blocks and noindex. ### How do AI answer engines affect my site? They still crawl or retrieve from an index and cite sources. To be cited, write clear, fact based pages with quotable lines, named entities and supporting details. ### What is a better or safer search engine than Google? “Better” depends on your use and market. Your job as a site owner is to be discoverable and useful wherever your users search. Measure results in each engine’s console. ### How do search engines work with images and reverse image search? They index images and their context, then match them to queries or a supplied image. Name files, add descriptive alt text, compress and serve responsive sizes so image results load fast. ## Read next - [How Google Search works: crawling, indexing, ranking, in plain words](https://porteur.ai/guides/how-google-search-works): Crawling, indexing, ranking. What happens to one of your pages, what you can influence, how long it takes, and how to check it in Search Console. - [How to use Google Search Console in ten minutes a week](https://porteur.ai/guides/how-to-use-google-search-console): A quick weekly routine: set four filters, compare 28 days, check pages then queries, and fix three findings, without getting lost in noise. - [Bing Webmaster Tools for a small site: what it gives that Google does not](https://porteur.ai/guides/bing-webmaster-tools): Set up Bing Webmaster Tools in minutes. Import from Search Console, reach Copilot and Yahoo, use Backlinks, Keyword Research, Site Scan and IndexNow. - [SERP](https://porteur.ai/glossary/serp): A SERP is a search engine results page. See its parts as of 2026, how to read features, how they affect clicks, and what to do on your site. - [Crawling](https://porteur.ai/glossary/crawling): Crawling is how Googlebot discovers and fetches your URLs. See what it fetched, fix slow or blocked areas, and know when crawl budget matters. - [Indexation](https://porteur.ai/glossary/indexation): Indexation means a page is stored in Google’s index and can appear in search. Here is how to check status, read Page indexing, and fix what blocks it. Want to see which engines can already find your pages and on what searches? Run the free Porteur check from your URL and read three findings in about thirty seconds. Free check: https://porteur.ai/