A rotary switch is a type of switch that operates by rotating a knob or lever to control different electrical circuits. It is commonly used in various devices like ovens, radios, and industrial equipment where multiple settings or functions need to be selected. As you turn the switch, it connects different contacts, allowing you to change the circuit or adjust settings, such as changing the speed of a fan or selecting a cooking mode. Rotary switches are valued for their durability and ability to handle multiple functions with a single control. They can have multiple positions, each corresponding to a specific setting or mode. The design is typically simple and intuitive, making rotary switches easy to use in both consumer and industrial applications.