A safety interlock is a device designed to prevent machinery or equipment from operating under unsafe conditions. It ensures that certain safety measures are in place before allowing the machine to function. For example, in a microwave oven, the door must be closed for the appliance to operate, preventing exposure to harmful radiation. These interlocks can be mechanical or electronic and are commonly used in various industries, including manufacturing and automotive. They help protect workers and equipment by ensuring that operations only occur when it is safe to do so, thereby reducing the risk of accidents and injuries.