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What is Google Search Engine?
A Google search engine is a web-based tool that enables users to locate information on the World Wide Web.
The Google story began in 1995 at Stanford University. Larry Page was considering Stanford for grad school and Sergey Brin, a student there, was assigned to show him around. By some accounts, they disagreed about nearly everything during that first meeting, but by the following year, they struck a partnership.
Crawlers :
Crawler is an automated program that systematically browses the Internet for new web pages. Google and other search engines use web crawlers to update their search indexes. Each search engine that has its index also has its web crawler.
Crawling the task of the crawler is to visit a web page, read it, and follow the links to other web pages of the site.
Each time the crawler visits a webpage, it makes a copy of the page and adds its URL to the index. After adding the URL, it regularly visits the sites like every month or two to look for updates or changes.
Google search Engine gives site oner choices about how to bots crawl this site also provides detailed instructions about how to process pages on their sites, can request re-crawling or not. that file is called robots. Text.