Snow skiing is a group of sports using skis as primary equipment. Skis are used in conjunction with boots that connect to the ski with use of a binding. Skiing can be grouped into two general categories. Nordic skiing is the oldest and includes sport that evolved from skiing as done in Scandinavia. Nordic style bindings attach at the toes of the skier's boots but not at the heels. Alpine skiing includes sports that evolved from skiing as done in the Alps. Alpine bindings attach at both the toe and the heel of the skier's boots. As with many disciplines, such as Telemark skiing, there is some crossover. However, binding style and history tend to dictate whether a style is considered Nordic or Alpine. Therefore, in view of its lack of a locking heel, and its roots in Telemark, Norway, Telemark is generally considered a Nordic discipline.