A beach is a depositional coastal landform composed primarily of unconsolidated sediment, such as sand, pebbles, or gravel, deposited by waves and currents. The formation and characteristics of a beach are governed by the interplay of sea-level fluctuations, wave energy, and local sediment supply. Beaches undergo constant processes of erosion and accretion; during high-energy storm events, sediment may be removed from the system, leading to erosion, while lower energy conditions allow for the gradual buildup and deposition of material. The composition of the beach material dictates its physical properties and its interaction with coastal processes, forming critical transitional zones between terrestrial and marine environments.