Orthogonal frequency-division multiplexing

Orthogonal Frequency-Division Multiplexing (OFDM) is a way of using multiple signals on one line or channel at the same time. It works by breaking up the signal into many different small pieces, and then sending each piece on a different frequency - like different radio stations on your radio. That way, each piece is not affected by the others, and so the signal can be sent and received more reliably, like when you talk to a friend on the phone.