What is web Crawling?

A web crawler is a program or automated script which browses the World Wide Web in a methodical, automated manner. This process is called Web crawling or spidering. Many legitimate sites, in particular search engines, use spidering as a means of providing up-to-date data.
 
Web crawler is an automated program searching on the internet, a web crawler (also known as spider) is a program to browse the World Wide Web in a methodical, automated way. Web crawler bot is a type of beetle, also known as search
 
A Web crawler is an Internet bot which systematically browses the World Wide Web, typically for the purpose of Web indexing (web spidering). Web search engines and some other sites use Web crawling or spidering software to update their web content or indices of others sites' web content.
 
A search engine crawler is a program or automated script that browses the World Wide Web in a methodical manner in order to provide up to date data to the particular search engine. While search engine crawlers go by many different names, such as web spiders and automatic indexers, the job of the search engine crawler is still the same.
Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index. We use a huge set of computers to fetch billions of pages on the web.
 
Web Crawling deals with large data-sets where you develop your own crawlers to extract the data from web.
 
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