What is infrared for PC?

It serves the same function as the remote controller for a television set. It is wireless and uses the infrared band of light to send digital signals over air to the receiver on the TV set. Since it is over air, the infrared radiation can be blocked by wood, metal, or any thick object that is between the remote and the TV. Try to keep the path clear for signals to be transmitted and received. The infrared for PC is basically the same wireless communication between the keyboard or printer or mouse and the receiver for the keyboard or printer or mouse, respectively. The receiver for a PC peripheral device also has to be in the line of sight with the transmitter, or the signal will not be heard.