The CAGED System
The CAGED system is one way of quickly turning open string major chord shapes into any other major chords, by simply learning the position of their Root / Key note on the neck of the guitar.

The CAGED system is so called as it refers to the major chords
C A G E D in the open position.

The Diagrams below show the open string chord shapes.
The Root / Key notes are shown as a red square.

C Major
A Major
G Major
E Major
D Major
The examples below show the CAGED system as moveable major chords that can be played in any position on the guitar as long as you know your Root/Key notes (shown as a red square)
C major shape as a chord of C sharp major
A major shape as a chord of C major
G major shape as a chord of B flat major
E major shape as a chord of F major
D major shape as a chord of E major