Guitar effects pedals are devices that alter the sound of an electric guitar. They can create a variety of sounds by modifying the guitar's signal before it reaches an amplifier. Common effects include distortion, delay, reverb, and chorus, each adding unique characteristics to the music. Musicians use these pedals to enhance their performances and achieve specific tones. They can be used individually or combined in a pedalboard for more complex soundscapes. Many guitarists experiment with different pedals to find their signature sound, making effects pedals an essential tool in modern music.