How Google Search Works


This image indicates that google has searched around 653,000 pages/websites from your keywords from its database in a time of 0.23 seconds, so basically it shows the exact time taken by Google to find the search query. i.e Google is providing such a quick result in a fraction of seconds, and among the top results are always based on SEO (Search Engine Optimization).
Have you ever wondered what happens when you type in a query in Google’s search field?

Google sends out Web crawlers, known as Google bots, that go through all the web pages on the World Wide Web.

These bots are made up of millions of computers that surf the Web much like how people do it, except they do it much more quickly. To make sure that they have the most current sites, these Google bots are working all the time, crawling and re-crawling websites.

How often a site is crawled depends on how quickly it's content changes. For example, a newspaper site that has frequent updates will get crawled more often than a static company site. Webmasters can also indicate how often they want their sites to be crawled.

The bots also detect all links on the site, which are then put into a queue system for crawling later on. These links are also important in deciding the search ranking of a site.

Copies of all these pages are stored in Google’s index database. The index works like the contents page of a book and contains all the possible search items.

When a user types in a query in the search engine, the index will match the query with all the webpages in which the query terms appear and then grab the pages for the search results, At the same time, a short description of the pages is generated for the search results page.
Web pages are ranked in terms of relevance before they are displayed on the results page. Google considers some 200 factors when ranking sites. One of them is PageRank, which takes into consideration how many sites are linked to a webpage and the quality of the linking sites.