How do they get the number?

Question

You know when they say that a show was watched by like "10 million viewers", how do they get that number? Does anyone know? Are the satellite and cable companies keeping track of what we watch or what?

Answer 1

Nielson Ratings.,.

I could give a long, detailed explanation - but Wikipedia does it soooooooooo much better than I can ;);)

Answer 2

signal response from when you select television channel from satellite to company providing services to cable companys