Television advertising is a form of marketing where businesses promote their products or services through short video segments shown on TV channels. These ads can vary in length, typically ranging from 15 to 60 seconds, and are designed to capture the attention of viewers during commercial breaks or specific programming. Advertisers often target specific audiences based on factors like age, gender, and interests. The effectiveness of television advertising is measured by ratings, which indicate how many people watched a particular program, helping companies decide when and where to place their ads for maximum impact.