Google collects a lot of data about you to sell to advertisers

We should all know by now that Google's business model is to provide free products and services and to monetise the data it collects from you. There is a scary amount of data that they track over time.

Source: https://www.theguardian.com/commentisfree/2018/mar/28/all-the-data-facebook-google-has-on-you-privacy (external link)