Chord diagram

A chord diagram is a visual representation of a chord on the first frets of the neck, seen from the front. The six strings are shown as vertical lines (low E on the left, high E on the right); the frets as horizontal lines. Circles indicate where to place fingers and which to use. An 'O' marks an open string that sounds, an 'X' a string to mute. It is the universal format for learning chords.