Okay kiddo, so you know how we have these big round things called tires on our car to help it move? Well, sometimes those tires can get something stuck in them or they can get old and worn out, and that can make them go flat.
When a tire goes flat, it means that the air inside of it has leaked out, which can make it hard or even impossible to drive the car safely. This is because when the tire is flat, it doesn't have enough air to support the weight of the car and help it move smoothly.
If you notice that one of the tires on the car looks really low or flat, it's important to stop and check it out. You might have to use a special tool called a tire gauge to measure how much air is in the tire, and if it's low, you may need to add some more air with a tire pump.
Sometimes, if the tire is really damaged or has a big hole in it, you might not be able to drive on it at all. If this happens, you'll need to call for help from someone who can come and fix the tire, like a tow truck or a mechanic.
Overall, having a flat tire can be a real bummer, but it's just a normal part of taking care of our cars and making sure they're safe to drive.