Google! The search engine you have heard often, Whatever it is, Most of them also know that Google track peoples what they have been searching and they keep an record, Its like they keeping an eye on you, but there is an unique search engine called Duckduckgo.com. The main difference between duckduckgo and other search engines is that duck does not track or bubble you.
This unique feature is that they do not sell your age profile for the ad community unlike other search engine such as Google, yahoo! If you like to know about duckduckgo.
Check the below link :