The answer to 'what is dimmer switch' is a type of electrical switch that allows you to control the brightness of lights. Dimmer switches work by reducing the amount of electrical current flowing to the light, which in turn reduces the light output. This allows you to create the perfect lighting level for any room or task.
Dimmer switches come in a variety of styles and can be used with incandescent, halogen, and some LED lights. They are commonly installed in living rooms, dining rooms, bedrooms, and other areas where you want more control over the lighting. Proper installation by a qualified electrician is important for safety and optimal performance.