Google knows pretty well everything about you and if you have a Google account , then they deliver ads based on what you surf to make them more relevant
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- Your search history – whether you have a Google account or not
- Your location history – its on by default on Android devices so if you want to know where you have been with your Android phone , its as easy as searching in your Google account
- Your voice history – what you say to OK Google – it records everything you say to your device
- Everything you search on You Tube
- All the apps and devices that you use that access your Google data , computers , phones , tablets and this is a very important list if you you think someone is accessing your data.
So where do you find this information ?
Go to your Google account settings or there are links on this page to the relevant sections