What is the main work of Search Engine Spiders?

[shakthipriya]

spiders travel the web to find as many new or updated web pages and links as possible. When you submit your web pages to a search engine at the "Submit a URL" page, you will be added to the spider's list of web pages to visit on its next search mission out onto the internet. Your web pages could be found, even if you didn't submit them. Spiders can find you if your web page is linked from any other web page on a "known" web site. It's no surprise then that it is important to build a library of links from other popular web sites back to yours. More about links between sites in a moment.