The difference between digital TV and the traditional kind (analogue TV) is the same as between a CD and an old-fashioned vinyl record. With vinyl records, the sound waves are copied into the vinyl – and then reproduced by the vibrations in the stylus… On a CD, the sound is converted into computerised information – and the CD player reads that information to re-create the sound.

The same process applies to Digital TV. The quality’s better AND the signal uses far less of the available space in the airwaves (bandwidth). So it makes room for many more channels than the five you get with analogue TV.