Outdoor advertising (also called out-of-home advertising or OOH) is a form of advertising that reaches people outside their homes in public places.
Outdoor advertising involves displaying ads in open, public spaces to promote products, services, or brands to people while they are traveling or spending time outdoors.

Common examples
- Billboards & hoardings
- Bus stop and railway station ads
- Posters and wall paintings
- Transit ads (on buses, trains, autos, metros)
- Street furniture ads (poles, kiosks, benches)
- Digital outdoor screens

Key features
- High visibility
- Reaches a large and diverse audience
- Location-based impact
- Repeated exposure (people see it daily)