Looking from above a wing, the wing has a definite shape or planform.
The distance from one wingtip to the other side of the aircraft wingtip is called the wingspan. The front of the wing facing the air moving toward the aircraft is called the leading edge, behind it - the trailing edge. The distance between the leading edge and the trailing edge is called the chord.
The root chord is closest to the fuselage of the airplane. Away from the center of the airplane on the wing you find the tip chord or the distance from the wing front to the wing back.