A "pure sine wave" refers to a smooth, continuous wave that represents an ideal electrical signal. It is characterized by its consistent frequency and amplitude, resembling the shape of a sine function in mathematics. This type of waveform is essential for many electrical devices, as it provides a stable and efficient power supply. In contrast to other waveforms, such as square waves or modified sine waves, pure sine waves produce less electrical noise and reduce wear on equipment. Devices like computers, audio equipment, and medical devices often require pure sine wave power to function optimally and avoid potential damage.