When you watch television long enough and follow entertainment news, you will eventually come across a discussion of ratings. How are they collected? What do they mean?
In America, we have the Nielsen Ratings System. The scope of it is limited, but it’s results could be totally ignored by networks.
There are politics of behind the scenes of networks. First, they may look at the ratings and decide to cut well-written shows from the lineup due to supposedly low viewership or keep in lesser shows because viewers seem to like the hot lead actress.