2. SEARCH ENGINES 

Google bot is used to describe anything that interfaces with the one that is using it (the users) or that collects data, also there are software programs which request pages much like a regular browser do. Goolgs determine the search results by the PAGERANK, it was invented to detrmine the importance of one web page, so when we search informarion they use this PAGERANK for determine how good is that information.AD SENSE is one of the products of the public browser online of google and AD WORDS is the program that google used for do sponsored advertising.