An analog signal is a communication method that uses changes in the amplitude or frequency of a continuous radio carrier wave to convey information. The term is often used in comparison with a digital signal. Analog television (and its analog storage mediums) is said to be inferior to today's almost universally used digital television. However, some contest that analog offers better quality.
In the world of audio technology (hi fi specifically), analog never completely lost its popularity, at least amongst hardcore audiophiles. And more so amongst classical music lovers whose enjoyment of a particular recording often could be affected by the ambience of the concert hall; something that went missing in the early days of digitally recorded CDs but has been largely overcome in modern recordings.