Google bot is software invented by Google INC, in technically we say it is watch dog for the content on website its duty is to crawl the entire website it will fetch all the information in the website and throw it in to data base server so that whenever any of the users from the part of the word can view with help of appropriate entering keywords in google search dialogue box.
Googlebot is Google's web crawling bot. 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.
Google bot also called as Spiders/Crawlers.Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index.
Googlebot uses an algorithmic process: computer programs determine which sites to crawl, how often, and how many pages to fetch from each site.