Transit advertising refers to promotional messages displayed on public transportation vehicles and facilities, such as buses, trains, and subway stations. This form of advertising allows brands to reach a wide audience, as millions of commuters encounter these ads daily during their travels. Common formats of transit advertising include posters, digital screens, and wraps that cover the entire vehicle. Advertisers often target specific demographics based on the routes and locations of the transit systems, making it an effective way to engage potential customers in urban areas.