What do you mean by a crawler?

A Web crawler, sometimes called a spider, is an Internet bot that 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.

Hello Friends,

A crawler is a program used by search engines to collect data from the internet. When a crawler visits a website, it picks over the entire website's content (i.e. the text) and stores it in a databank. It also stores all the external and internal links to the website.

Crawler is the search engine robot which crawls the website on internet.

Crawlers are designed instruments by Google which checks your website with regards to clicks, impressions, plagiarism and many other things. It is because of the crawlers a website gets ranked higher or lower based on what they report about your website.

A crawler is a program used by search engines to collect data from the internet.

A crawler is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index. Crawlers apparently gained the name because they crawl through a site a page at a time, following the links to other pages on the site until all pages have been read.