Binary Phase Shift Keying (BPSK) is a digital modulation technique used in communication systems. It encodes data by changing the phase of a carrier wave between two distinct states, representing binary values 0 and 1. This method is known for its simplicity and robustness against noise, making it suitable for various applications, including satellite communication and wireless networks. In BPSK, the phase of the carrier signal is shifted by 180 degrees to represent the two binary states. This phase change allows for effective transmission of information over long distances while maintaining signal integrity. BPSK is a fundamental technique in digital communications, often serving as a building block for more complex modulation schemes.