One of the more interesting places to check out what Google really knows about you is to head over to its ad settings page where (if you're signed into your Google account) you'll see a profile Google has built for you based on your search history, YouTube history and interests. So, for example, it might know that you're female, aged 18-24 and interested in banking, consumer electronics, mobile phones, shooter games, rap and hip hop and toys.
Google doesn't make a huge song and dance about its in-depth knowledge of its users, but at the same time it doesn't keep it a secret either. Here's how to find out what Google knows and take control of your data.
Google saves every voice search
Google records what you say every time you speak to itGoogle's voice search-saving habits have been reported on many times.
Anyone who use Google's voice search or the voice-activated assistant, Google Now, have their searches stored so that more relevant ads are served and search features are steadily improved -- in the same way you'd expect from regular Google search.
And a lot of people don't realize that many of these searches are actually recorded. This means users are able to listen back to exactly what they searched for by listening to what they said and how they said it.
How to delete it: If you've used any of Google's opt-in voice features for yourself, then head to Google's Voice & Audio Activity page to review your voice searches and listen back to them. Be warned, this could be interesting, funny or just plain cringe-worthy.
To delete this database of embarrassing searches select one or more of the recordings from the check box beside them and then click "delete" at the top of the screen.
Google saves all your searches
Probably the least surprising of the lot, but Google has all of your search history stored up.
How to delete it: If you'd rather not have a list of ridiculous search queries stored up, then head to Google's My Activity, click Menu (the three vertical dots) and select "Delete Activity By"
If you want to stop Google tracking your searches for good, head to the activity controls page and toggle tracking off as needed.
Curled from Wired