How Search Engines Work
Before you can rank, you need to know how Google actually finds, understands and orders web pages. It happens in three steps: crawling, indexing and ranking.
Step 1 — Crawling
Google uses software called a crawler (or spider/bot) named Googlebot. It follows links from page to page across the web, downloading the content it finds. If a page has no links pointing to it and is not in your sitemap, Google may never discover it.
Step 2 — Indexing
After crawling, Google tries to understand the page — what it is about, the keywords, the images, whether it is high quality — and stores it in a giant database called the index. If your page is not indexed, it simply cannot appear in results.
Step 3 — Ranking
When someone searches, Google looks through its index and ranks the most relevant, trustworthy pages using hundreds of signals. The best matches appear at the top of the SERP (Search Engine Results Page).
Think of a library. The crawler is the assistant who reads every new book. The index is the catalogue where each book is filed by topic. Ranking is the librarian handing you the best book for your exact question, first.
Pro tips
- Make sure important pages are linked internally so crawlers can reach them.
- Submit an XML sitemap in Google Search Console to help discovery.
- Use the URL Inspection tool in Search Console to check if a page is indexed.
Common mistakes
- Blocking pages in robots.txt by accident so Google cannot crawl them.
- Assuming a new page ranks instantly — it must be crawled and indexed first.
- Orphan pages with no internal links that crawlers never find.
Search engines work in three steps: crawling (discovering pages), indexing (understanding and storing them) and ranking (ordering the best results). If a page is not crawled or indexed, it cannot rank.