What is the main work of Search Engine Spiders?

[bathsvanities]

What is the main work of Search Engine Spiders? Please suggest

[Carlbrewster]

Spider or crawler surf on the network and gather new information and send to the database.

[VanCellfixx]

In my opinion main work of Search Engine Spider is to crawl your website, A Web crawler, sometimes called a spider, 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 indexes of others sites' web content.

[cleaningservice]

Spider is a program created by Google, its works is visit to the websites and read their pages and many information.