The verb google and the noun googol are commonly confused because they have similar pronunciations. Google is the word that is more common to us now, and so it is sometimes mistakenly used as a noun to refer to the number 10100. That number is a googol, so named by Milton Sirotta, the nephew of the American mathematician Edward Kasner, who was working with large numbers like 10100. Google, on the other hand, is the name of a search engine as well as a verb that refers to searching the Internet using the Google search engine. (The search engine’s name was inspired by the number: the founders of Google chose the name to reflect their mission “to organize a seemingly infinite amount of information on the web.”) You can remember that the number is spelled googol by remembering that a googol has lots of o’s.
Two related words, googolplex and googleplex, are also commonly confused. A googolplex is the number 1 followed by a googol of zeros; the Googleplex is the Mountain View, California headquarters of Google.