A trajectory is the path that an object follows as it moves through space. This path can be influenced by various forces, such as gravity, air resistance, and initial speed. For example, when a ball is thrown, its trajectory is determined by the angle and speed at which it is launched. In physics, understanding trajectories is important for predicting where an object will land. This concept is used in many fields, including aerospace engineering and sports science. By analyzing trajectories, scientists and engineers can improve the design of projectiles and enhance performance in activities like basketball or golf.