What is the input and output of a TV remote?

The input of a TV remote consists of button presses made by the user, which can include commands like changing the channel, adjusting the volume, or powering the TV on or off. The output is the corresponding action performed by the TV in response to those commands, such as displaying a different channel or altering the sound level. Essentially, the remote acts as a wireless controller that transmits infrared or radio signals to the television.