Ok, kiddo. Have you ever watched TV? Great! When you watch TV, you are watching a "channel."
A channel is like a big water pipe that carries different types of water to different places. But instead of water, TV channels carry different types of TV shows to different TV sets.
When your parents turn on the TV and pick a channel, they are selecting which water pipe they want to use to deliver TV shows to your TV. Each channel is like a different pipe that carries different shows. Some pipes carry cartoons, some carry news, and some carry movies.
So, when you watch TV, you are basically picking which pipe you want to use to get your favorite TV shows. It's like picking which straw to use to drink your juice!