A multi-axle bus is a really big bus that has more than two wheels on each of its axles.
Now, wait, what is an axle? An axle is like a rod or shaft that holds the wheels in place.
So, imagine you have a regular bus with two wheels on each axle. Now, if you add more wheels to each axle, it becomes a multi-axle bus.
Why would someone want a multi-axle bus, you may ask? Well, a multi-axle bus can carry more weight and handle rough terrain better.
Just like how it's easier to carry a heavy bag with two straps instead of one, a multi-axle bus can distribute the weight of the passengers and luggage over more wheels, making it more stable and capable of carrying more people and stuff.
So, next time you see a really big bus that looks like it has lots of wheels, it's probably a multi-axle bus!