Normally, airfoil is nothing but the wing shape of the glider. When we use it, we mean the cross-sectional shape of the wing. Airfoil plays a great role in flying the glider. The leading edge is the front edge of the wing, the trailing edge is the back edge of the wing, the chord line is the connecting line from the leading edge to the trailing edge, the camber line is almost the chord line but it equidistant from the upper and the lower surfaces of the glider, and the camber is the asymmetry between the top and bottom curves of an airfoil (in a vertical cross section).
In the following figure, you can see a few types of airfoil:
The speed and the gliding varies from airfoil to airfoil. To me, the best airfoil type is ...
