Additive synthesis is a sound synthesis technique that creates complex sounds by combining multiple simple waveforms, typically sine waves. Each waveform is added together at different frequencies and amplitudes, allowing for the construction of rich and varied tones. This method is based on the principle that any sound can be formed by adding together its harmonic components. In additive synthesis, each individual waveform can be controlled independently, enabling precise manipulation of the sound's timbre and texture. This approach is often used in digital audio workstations and synthesizers, making it a popular choice among musicians and sound designers for creating unique audio experiences.