An analog signal is a type of signal that represents information in a continuous form. It varies smoothly over time, capturing changes in physical phenomena such as sound, light, or temperature. For example, the sound waves produced by a musical instrument can be represented as an analog signal, where the amplitude and frequency correspond to the loudness and pitch of the sound. Unlike digital signals, which use discrete values (like 0s and 1s), analog signals can take on an infinite number of values within a given range. This characteristic allows them to provide a more accurate representation of real-world information, making them essential in applications like audio transmission and television broadcasting.