Channel capacity is a concept in information theory that refers to the maximum rate at which data can be reliably transmitted over a communication channel. It is a measure of the channel's ability to carry information without errors or interference. Channel capacity is determined by factors such as the bandwidth of the channel, the signal-to-noise ratio, and the modulation scheme used. Researchers in this area study ways to maximize channel capacity through coding techniques, error correction schemes, and other methods to improve the efficiency and reliability of communication systems.