Can you explain end-to-end what you mean about advertisers making money out of the tracked data? (eg. what you think they track, what they do with the data, how

Can you explain end-to-end what you mean about advertisers making money out of the tracked data? (eg. what you think they track, what they do with the data, how they make money from the data, etc.) I think it's very easy for different people to mean different things when having conversations on this topic, so it's good to spell it all out.