Search engines: they arent browsers, they are programs that search the web finding the most precise answers to your search.



Google: google doesn't search the web each time you look for something on it, because they have an index, they searche there and its a lot faster than other browsers.

Google bots: Are some programs that google use to search the web every 24 hours so they can maintain their index actualized.

Page rank: It's the amount of pages having some links that point to your web page, that are called backlinks, this is how google classify the order on how your results appear. 

Ad sens ad words: this is the part where google have advertisments for people trying to find something to buy, you can have a deal with google so you can have your own advertisment and pay for when, with what words it would appear. you can buy some elements by internet acording on the advertisment.