* Nielsen ratings: Nielsen is a company that measures TV viewership in the United States. Nielsen uses a panel of households that agree to have their TV viewing habits tracked. Nielsen then uses this data to create ratings for TV shows, which are used by networks to make decisions about which shows to renew and cancel.
* Smart TVs: Smart TVs are TVs that are connected to the internet. Smart TVs can collect data about what shows you watch, and this data can be shared with TV networks.
* Streaming services: Streaming services like Netflix and Hulu can also collect data about what shows you watch. This data can be used to personalize your recommendations and track your progress on TV shows.
TV networks use this data to learn more about your viewing habits and preferences. This information can be used to develop new shows that you're likely to enjoy, and to improve the overall viewing experience.