A matatu is like a big bus that you might see in Kenya or other parts of Africa. It's like a taxi that can fit a lot of people at once. Matatus are usually really brightly colored and decorated with lots of pictures and designs. They are very important for getting around in Kenya because they can go to many different places and are cheaper than other types of transportation.
Matatus usually have a driver and a conductor who collects money from the passengers. Sometimes, they play loud music or have TVs inside to keep the passengers entertained during the ride. When you want to get off, you just tell the conductor and they'll let you out at the next stop.
Matatus can be a lot of fun, but they can also be crowded and sometimes uncomfortable. It's important to be careful when riding a matatu and make sure you know where you're going before you get on. But overall, they're a great way to explore Kenya and experience the local culture.