A guitar chord is a combination of three or more notes played simultaneously on a guitar. Chords are the building blocks of music, providing harmony and structure to songs. Each chord is typically named after its root note, such as C major or G minor, and can be played in various positions on the fretboard. Chords can be played in different ways, including strumming or fingerpicking. They can also be modified with additional notes or altered to create different sounds, such as seventh chords or suspended chords. Learning chords is essential for anyone looking to play the guitar and understand music theory.