What is the root note of a G chord and how is it played on the guitar?

The root note of a G chord is G. To play a G chord on the guitar, place your index finger on the 2nd fret of the A string, your middle finger on the 3rd fret of the low E string, and your ring finger on the 3rd fret of the high E string. Strum all the strings except for the low E string.