There are two common Google spiders.

One is used by search engines, called Googlebot. It will visit the established web pages, collect the links on the web pages, and find other web pages according to these links. Through these links, the world's web pages are connected into a huge network, so these googlebot crawling on the network are also called Google Spiders.

There is also a spider called Mediabot, which is also owned by Google. Its purpose is to crawl web pages to match the content-related advertisements of Google AdSense.

In the past, the most important spider in search ranking was Googlebot, the webmaster who participated in Google AdSense advertisement. If their web pages have Google AdSense code, the content of the web pages crawled by Mediabot will be added to the search engine, so these web pages will be included more quickly.