Okay, sweetie, have you ever seen a big bus driving around with pictures and words on it? That's called bus advertising! It's a way for companies or organizations to show their message or products to lots of people as the bus drives around town.
The pictures and words are usually on the side or back of the bus, and they can be really colorful and eye-catching. Sometimes they even cover the whole side of the bus! The company or organization pays to have their message put on the bus, and then the bus company drives it around on its usual routes.
Lots of people see the bus every day, and the advertising can make them remember the company or product. It's like a big moving billboard that can go to different parts of the city, instead of just staying in one place like a regular billboard. Plus, it's fun to see a bus driving by with cool pictures on it!