An arc is a segment of a curve, often seen in circles or other geometric shapes. In mathematics, it represents a portion of the circumference of a circle, defined by two endpoints. Arcs can vary in size, from small sections to larger portions, and are commonly used in geometry to describe relationships between angles and distances. In everyday life, arcs can be observed in structures like bridges and arches, where they provide strength and stability. The concept of an arc is also important in fields like physics and engineering, where it helps in understanding trajectories and the motion of objects, such as in the path of a thrown ball.