A wah pedal is a dynamic filter effect that sweeps through frequencies to create a vocal-like “wah” sound. It works by adjusting the emphasis on different frequencies as the pedal is rocked back and forth, allowing guitarists to create expressive, rhythmic tones. Wah pedals are widely used in funk, rock, blues, and metal, with players like Jimi Hendrix, Eric Clapton, and Slash making them iconic. Some wah pedals have adjustable Q controls, auto-wah functions, or switchless activation. Popular models include the Dunlop Cry Baby, Vox V847, and Morley Bad Horsie, each offering unique tonal characteristics.