Final answer:
Dayparts are the time segments into which a broadcast day is divided, used for scheduling and pricing commercials based on audience viewing habits.
Step-by-step explanation:
The various time periods or segments into which a broadcast day is divided are known as Dayparts. These consist of blocks of time where television broadcasting schedules are broken up and typically labeled, such as morning shows, daytime, prime time, and late night. The division is based on the different viewing habits of the audience throughout the day, and is crucial for advertisers and broadcasters when planning and pricing commercial airtime.