Reverb simulates the natural echoes and reflections of sound in different spaces, adding depth and atmosphere to a guitar’s tone. It can range from short, subtle room reverbs to large, ambient cathedral-like spaces. Common types of reverb include spring reverb (found in vintage amplifiers), plate reverb (a smooth studio-style effect), and shimmer reverb (which adds ethereal, harmonised overtones). Reverb is essential in many genres, from surf rock and blues to shoegaze and ambient music. Popular reverb pedals include the Boss RV-6, Electro-Harmonix Holy Grail, and Strymon BigSky, offering everything from classic warmth to expansive soundscapes.