Manual dimmers are devices used to control the brightness of lights in a room. They allow users to adjust the light level by turning a knob or sliding a lever, providing flexibility in creating the desired ambiance. Manual dimmers are commonly found in homes and can be used with various types of light bulbs, including incandescent and LED. These dimmers are typically installed in place of standard light switches and are easy to use. By simply adjusting the control, users can enhance their environment for activities like reading, watching movies, or entertaining guests. Manual dimmers are a cost-effective way to improve lighting control without the need for complex technology.