All you have must noticed that Google has been updated their privacy policy recently in March 31st, 2014. Since in previous year Google already updated its privacy policy twice, in June 24th and December 20th.
This privacy policy is the latest one which contains many information in
brief although if you like to compare it with the old one here is the
link and also take look of
archive of updates regarding Privacy Policies
since June 9th, 1999