Websites use cookies to remember you. Which is fine, and very often necessary for the website to work correctly. For example, a website where you login, like Reddit, will use a cookie to remember that you are logged in.
This means that Reddit can track how do you use Reddit.
But the privacy laws say that you have to consent before the website would send the data captured while you browse the website to other companies. For example, to allow Reddit to send your browsing data to Google. And each other site you use might also send data to Google.
In this case, Google has a huge amount of data on you, if they know, in detail, what did you do on every website you visited, and when.
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