A bell is a hollow, typically metal object that produces a ringing sound when struck. It is often shaped like a cup or a dome and can vary in size from small hand bells to large church bells. Bells are commonly used in various settings, including schools, churches, and public events, to signal the start or end of an activity. Bells can be made from different materials, such as bronze or brass, and are often tuned to specific musical notes. The sound of a bell is created by the vibration of its body when it is hit by a clapper or another object. Bells have been used throughout history for communication and celebration, often associated with events like weddings or holidays.