Okay kiddo, let me explain what a frequency divider is. You know how we count numbers, right? We start from zero and then we count one, two, three, four, and so on. A frequency divider does kind of the same thing, but with sound waves!
Imagine you have a sound wave that's going up and down really fast, like a bouncy ball bouncing really quickly. A frequency divider takes that super-fast bouncy-ball sound wave and slows it down so it bounces less frequently, like if you started bouncing the ball more slowly.
So the frequency divider takes a really high-pitched sound wave and divides it in half, or in thirds, or in quarters - just like how we divide up numbers when we count. This way, the sound wave becomes a lower-pitched note that we can hear more easily.
For example, let's say we have a sound wave that vibrates at 1000 times per second. That's a really high-pitched sound that might be hard for us to hear. But if we use a frequency divider that divides the wave in half, then it will now vibrate at 500 times per second - a lower pitch that's easier to hear.
So that's what a frequency divider does, it takes a really fast and high-pitched sound wave and gives us a slower, lower-pitched one that's easier to hear.