How Google Works

whenever we search for a query in Google it gives relative and immensive information from web pages matching the search query which searchers did. Hence it is must for an SEO to know, how Google process the query and fetch its relative results (i.e.) Understanding Google is much more important. Let's see how Search Engine works,

All Search Engines do the following process regularly to give the matching and updated results for an search query,

1. Crawling
2. Indexing
3. Search Results
   

Crawling:
All major search engines has a software program called spiders or bots. which will be sent around the internet and it will be continuously monitoring for new web pages and updates for indexed sites regularly around the internet. In case if the bot finds any new pages or updates it will crawl through them and fetch the pages and all the contents in those pages and add those pages to index.
If the crawler finds any links to other pages in the crawling page then it will add those Url's to the list of pages to crawl.
Major search Engines won't accept payment to crawl your page regularly, hence it is must to update our site regularly to get crawled and indexed.

Indexing:
The crawled pages are stored in huge server in sections or categories, based on the keywords and relative contents which they find in those pages along with the title tags, meta description tag, alt attributes and heading tags in it. It ranks them over there based on their inbound links and also by compiling and comparing those informations found with its relative pages and information in their database fetched earlier by bots from other pages.This entire process is known as Indexing.

Search Results:
The search results are produced as a result of matching information for the search query given by the searcher to the search engine. Generally, all the results will be realted to the search query.
Major search engines gives Related Searches, Spelling Suggestions, and other keywords. These features are designed to help users save time by displaying related terms, common misspellings, and popular queries.