A triangle wave is a type of waveform that has a distinct triangular shape, characterized by a linear rise and fall in amplitude. It alternates between a maximum and minimum value, creating a repeating pattern. Triangle waves are commonly used in electronics and signal processing due to their simple harmonic properties. In terms of sound, triangle waves produce a unique tone that is softer than square waves but sharper than sine waves. They are often utilized in synthesizers and music production to create various audio effects. Triangle waves can be analyzed using Fourier series, which breaks them down into their fundamental frequency and harmonics.