DIN rails are standardized metal rails used to mount and organize electrical components within enclosures, such as circuit breakers, relays, and terminal blocks. Named after the German Institute for Standardization (DIN), these rails are widely used in electrical cabinets and control panels, providing a secure and efficient way to install and arrange multiple devices in a compact space. DIN rails come in various sizes, with the most common being the 35mm wide version, and they facilitate easy installation, maintenance, and scalability of electrical systems.