Advertisement is often repeated on TV for several reasons:

1. Reinforcement: Repeating an advertisement helps reinforce the message and increases the chances of it being remembered by viewers. This is particularly important considering the short attention span of viewers and the large number of commercials they are exposed to.

2. Brand recognition: Repeated exposure to an advertisement helps create brand recognition among viewers. By seeing the same advertisement multiple times, viewers are more likely to associate the brand with the product or service being advertised.

3. Persuasion: Advertising is often aimed at persuading viewers to take a specific action, such as purchasing a product or using a service. Repeating an advertisement can increase the persuasive impact by presenting the message in different ways or reinforcing key selling points.

Mass media refers to various forms of media that reach a large number of people simultaneously. It includes television, radio, newspapers, magazines, and the internet. Mass media plays a crucial role in shaping public opinion, disseminating information, and entertaining audiences on a mass scale. It is an essential tool for communication, advertising, and sharing news and entertainment content with a wide audience.