What does a 'rest' symbol indicate in music notation?

The 'rest' symbol in music notation specifically indicates silence for a certain duration. Each type of rest corresponds to a specific length of silence, just as notes correspond to a specific duration of sound. For example, a quarter rest signifies a pause lasting for the duration of a quarter note, while a whole rest indicates silence for a whole measure. This allows composers and musicians to create rhythm and structure within their music by designating when there should be no sound, which is just as important as when to play notes. Understanding rests is crucial for performing music accurately, as they play a significant role in the overall timing and expression of a piece.