A tremolo arm, also known as a whammy bar, is a lever attached to the bridge of an electric guitar. It allows players to bend the pitch of the strings, creating a vibrato effect. By pushing or pulling the arm, musicians can achieve a range of sounds, enhancing their performance. This device is commonly found on guitars like the Fender Stratocaster and Gibson Les Paul. The tremolo arm can be used for various musical styles, from rock to blues, adding expressiveness to solos and chords. Proper use of the tremolo arm can significantly impact a guitarist's tone and technique.