SEARCH ENGINES: A program that searches documents for specified keywords and returns a list of the documents where the keywords were found. Search engine is a  general  class of program but the term is often used specifically for Google, Alta vista, and excite.









GOOGLE: is a search engine, one of the most use search engine of the world.




GOOGLE BOTS: is a search bot software used by google which collects       documents from the web to build a searchable  index for google search engine.








PAGE RANK: is a link analyzing that is used by google, that assigns a numerical weighting to each element hyperlinked set of documents. With the purpose of measuring it's relative importance.

    

         AD-SENS-AD-WORDS: google adsens is a program run by google that allows that publishers in the google network of content sites to serve automatic text, images, videos. Google adwords  is google's main advertising product and main source of revenue.

http://en.wikipedia.org/wiki/AdSense
http://en.wikipedia.org/wiki/PageRank
http://en.wikipedia.org/wiki/AdWord
http://en.wikipedia.org/wiki/GoogleBot