A Recent study and research have proved that the largest and most efficient search engine can only cover a portion of the content that is publicly available. To sum up, no search engine indexes more than 16% of the web. Since, it has been proved that the crawler downloads just a fraction of the web [...]

A Web Crawler is a program that browses the worldwide web in a typically arranged, ordered and mechanized manner. A web crawler is also popularly known as a web spider or ant.
Web crawlers create a copy of all the frequently visit sites. The copies are further used by search engine. The search engine indexes the [...]