A highway bus is like a big car that takes people from one place to another on a long road called a highway. It is bigger than a car and can carry many more people at once.
When you want to go somewhere far away, you can take a highway bus instead of driving your own car. That way, you don't have to worry about driving on a long trip or getting lost on the way.
The bus driver sits in the front and drives the bus, and everyone else sits in seats that face forward. You can look out the window and see all the things passing by as the bus drives down the highway.
There are also toilets on the bus in case you need to go to the bathroom, and sometimes there is a little TV or radio that you can watch or listen to during the trip.
When you arrive at your destination, the bus stops and you get off with all the other passengers. It's a very convenient way to travel long distances!