A bandplan is like a map that helps people who like to talk to each other using radios know which parts of the radio waves they can use. It's like thinking about a big playground where kids can play different games, like basketball or tag. Different games need different areas of the playground to make sure they don't run into each other and get hurt.
In the same way, radio users have to be careful about which frequencies they use so they don't accidentally talk over someone else or cause a lot of noise. The bandplan is like a rulebook that helps everyone using radios know which frequencies they can use and when.
It's really important to follow the bandplan so everyone can have fun talking on their radios without causing any problems. Just like when you play a game with your friends, you have to agree on the rules so everyone can have fun and stay safe.