Binary Frequency Shift Keying (FSK) is a type of digital modulation technique used to transmit data over communication channels. In binary FSK, two distinct frequencies represent binary values: one frequency for a '0' and another for a '1'. This allows for reliable data transmission, as the receiver can easily distinguish between the two frequencies. This method is commonly used in various applications, including radio communication and modems. Binary FSK is favored for its simplicity and robustness against noise, making it suitable for environments where signal integrity is crucial.