Okay kiddo, have you ever noticed how some cars are really small and cute, almost like a toy car? Well, those are called kei cars!
Kei cars are special kinds of cars that were made in Japan a long time ago, and they have some rules they need to follow. They have to be really small, so they can't be longer than 3.4 meters or wider than 1.48 meters. They also can't be too powerful, so they have a limit on how much gas they can use and how fast they can go.
But why would anyone want a car that is so small and not very fast, you might wonder? Well, kei cars were designed to be affordable for people who live in big cities and don't need a big car. They can be easier to park and drive in places where the roads are really crowded. Plus, since they don't use as much gas, they are good for the environment and to save money on gas.
So, that's what a kei car is. It's a small, cute car that follows some special rules and is made to be affordable and good for driving in crowded cities.