To find out what Google knows about you, go to MyAccount and then click ‘your personal info’. Through it you can see your phone number, email, and turn off Google’s ability to track your search history if you so wish.
The settings allow you to stop Google tracking your location (yes, it has a map of everywhere you go on a logged-in device) and stop it storing your voice searches and information from your Android phone, should you have one.
You can also turn off Google’s archive of your YouTube searches and the YouTube videos you watch – and download a copy of all the data it possesses about you. Finally – users can also opt out of seeing targeted adverts although Google cautions this will make them ‘less relevant’.