What is the role of a "data compressor" in signal processing?

A) To increase the signal's amplitude

B) To reduce the amount of data needed to represent a signal

C) To filter out noise

D) To change the frequency of the signal

Answer: B) To reduce the amount of data needed to represent a signal

Explanation: A data compressor reduces the size of digital signals, allowing for more efficient storage and transmission without significant loss of quality.