Phase Shift Keying (PSK) is a digital modulation technique used to transmit data by changing the phase of a carrier wave. In PSK, the phase of the wave is altered to represent different data values, allowing for efficient communication over various media. This method is commonly used in wireless communication systems, including Wi-Fi and Bluetooth. There are several variations of PSK, such as Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK). Each variation uses a different number of phase shifts to encode information, impacting the data rate and robustness of the signal. PSK is valued for its ability to maintain signal integrity in noisy environments.