A bursting disc is a safety device used to protect pressure vessels and pipelines from overpressure. It consists of a thin, predetermined material that ruptures at a specific pressure, allowing the excess pressure to escape and preventing potential explosions or equipment damage. These discs are commonly made from metals or polymers and are designed for one-time use. Once a bursting disc activates, it must be replaced to restore the system's integrity. They are often used in industries such as oil and gas, chemical processing, and pharmaceuticals to ensure safe operation under varying pressure conditions.