Okay, kiddo, you know how when you get new toys and clothes, they sometimes have a year written on them? That's because they were made in a specific year and that year is important for people who want to know when something was made.
It's the same with cars! Car companies make new models of cars every year, with different designs, features, and improvements. The year when a car is made is called its "model year."
So let's say you see a car that was made in 2021. That means it's a 2021 model year car. But next year, a new 2022 model year car will come out. It's like how you get a new toy every year, but it's just a car instead!
People use model year to know how old a car is and what features it might have. It's important to know in case the car needs repairs or if you're buying or selling a car. Plus, it's just fun to know what year your car was made!