Google is known to keep history with each search that you have made on the web. According to the company you can delete past searches, browsing history or other activities from your Google Account.
The site history.google.com will lead you to your activity stored in your account. 
When you use Google products and services, the company retains data in your account, such as when and how you use certain features. The company though maintains this data, even if you delete your activity.
Για παράδειγμα, αν επισκεφτείτε τη σελίδα "Η δραστηριότητά μου" και διαγράψετε μια αναζήτηση που κάνατε στην Google, η εταιρεία θα γνωρίζει ότι αναζητήσατε κάτι (τον τόπο και τον χρόνο) αλλά όχι τον όρο αναζήτησης. Οπότε αυτό που θα διαγραφεί τελικά θα είναι μόνο οι terms of the searches you have made.
If you want to turn it off data collection location you can do it from here. Naturally no one can guarantee that Google will stop recording your activities.
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