BMX stands for Bicycle Motocross. It's a type of bicycle that is designed for doing tricks and riding on dirt tracks. It's different from a regular bike because it has smaller wheels, a shorter frame, and special types of brakes. BMX bikes can also have special features like pegs on the wheels which help with doing cool tricks.
If you've ever watched people ride BMX bikes, you might have noticed that they do all kinds of crazy tricks. They might jump off ramps, do flips and spins, or ride on rails and ledges. The reason they can do this is because BMX bikes are built to be very sturdy and durable. They can handle a lot of wear and tear without breaking.
BMX is a very popular sport, and there are competitions all over the world. These competitions are usually held on dirt tracks with lots of jumps and obstacles. Riders compete by doing tricks and showing off their skills. It takes a lot of practice and skill to be good at BMX, but it's also a lot of fun!