Does google really save user infos?

i saw it on tv, don't remember the exact channel..but they were talking about how google collects info of people who use google. is that for real? anyway to prevent it?

 

Yes, it's true.
In order to prevent it,just disable cookie and uninstall google bar.

 

That way they can get a better idea what your "internet behaviour" is, alot of compnies do this not just Google.