Have you ever seen a clock that magically adjusts itself to the correct time without anyone having to change it? That's called a radio clock!
So, do you know what a radio is? It's a special machine that can pick up signals and sounds that are sent through the air, like music or people talking. A radio clock is a clock that uses these signals to make sure that the time on the clock is always correct.
Some radio clocks use signals sent by a special tower that sends out a signal with the correct time. The radio clock just listens for that signal and then changes the time on the clock to match.
It's kind of like when your mom or dad tells you what time it is so you know when you have to clean up your toys - only instead of your parents telling you the time, the radio clock listens to a special tower that tells it the time.
This means that no matter where you put the radio clock, it will always be set to the correct time, as long as it can pick up the signal. This is really handy for people who want to make sure they're always on time!