Tune the radio or tune in?

1. Is it tune on or tune in?
2. What does it mean by tune in?
3. What does tune mean on a radio?

Is it tune on or tune in?

If you tune in to a particular television or radio station or programme, you watch or listen to it. If you tune in to something such as your own or other people's feelings, you become aware of them.

What does it mean by tune in?

to watch or listen to a particular television or radio program or station: Be sure to tune in to next week's show.

What does tune mean on a radio?

The verb tuning in radio contexts means adjusting the receiver to detect the desired radio signal carrier frequency that a particular radio station uses.