Goal refers to a method of scoring in many sports. It can also refer to the physical structure or area of the playing surface where scoring occurs. In several sports, a goal is the sole method of scoring, and thus the final score is expressed in the total number of goals scored by each team. In other sports, a goal may be one of several scoring methods, and thus may be worth a different set number of points than the others. The structure of a goal can vary widely from sport to sport. In sports where goals are the sole method of scoring, the goal is often a rectangular structure that is placed at each end of the playing surface. Each structure usually consists of two vertical posts, called the goal posts, supporting a horizontal crossbar. A line called the goal line is also marked on the playing surface where each goal is located, parallel to the crossbars. Thus, the objective is to send the ball or puck between the goal posts, under the crossbar, and across the goal line. There is often a net to catch the ball or puck as it is sent into the goal. Other sports have very different structures, but have a variation on the theme of goal lines, goal posts, crossbars, and nets.