8PSK, or 8 Phase Shift Keying, is a digital modulation technique that encodes data by varying the phase of a carrier wave. It uses eight distinct phase shifts to represent three bits of information per symbol, allowing for more efficient data transmission compared to simpler modulation schemes like BPSK or QPSK. This method is commonly used in applications such as satellite communications and wireless networks, where bandwidth efficiency is crucial. By increasing the number of phase states, 8PSK can transmit more data in the same amount of time, making it a popular choice for high-speed communication systems.