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 of 0 and 1. Each phase shift corresponds to a specific bit, allowing for efficient transmission of information over various media. In BPSK, the two phases are typically 180 degrees apart, making it robust against noise and interference. This simplicity makes BPSK suitable for applications like satellite communication and wireless networks, where reliable data transmission is essential.