A power chord is a simple musical chord commonly used in rock music. It consists of just two notes: the root note and the fifth note. For example, if you play a G power chord, you would play the G note along with the D note. This creates a strong, full sound that is easy to play on the guitar. Power chords are often played on electric guitars using distortion effects, which enhances their impact. They are typically notated as "5" (e.g., G5) and can be moved up and down the neck of the guitar to play in different keys. This versatility makes them a favorite among guitarists.