How To Find What Google Knows About You

By using Google's services you agree to share a ton of information that it can share with advertisers. To find out everything Google knows about you do the following

Step 1 : Login to your google account

Step 2 : Visit History.Google.Com

This brings up a list of things you've searched. But you can delete your history all at once using delete options

You can also see all the voice and audio activity google saves.

You can also check your saved location history 

To see what Google tells advertisers about you go to My Account -> Ads settings -> Managed Ad Settings 

Here Google collects what they think are your Interests, Gender and Age. You can stop Google from showing you ads based on your search history.