Okay, so do you remember playing with walkie-talkies or toy radios with your friends? Well, there are grown-up versions of those radios that people use to talk to each other, but they can go a lot further than just down the street.
These grown-up radios are called amateur radios, and they use something called radio waves to send signals from one radio to another. But just like how you can't hear your friend's walkie-talkie if they're using a different channel, there are rules about which frequencies or channels people can use to talk on their amateur radios.
These rules are called amateur radio frequency allocations, and they help make sure that different people don't accidentally talk over each other and cause a big mess. Think of it like a playground with different areas for different games, so that everyone can play without running into each other.
The people who make these rules are called governments or international organizations, and they have decided which frequencies or playground areas are for amateur radio use, and which ones are for other uses like TV or cell phones.
So whenever someone wants to use their amateur radio, they have to make sure they're using the right frequency for their area or "playground" and following the rules that go along with it. This way, everyone can talk on their radios without interfering with each other and have fun!