A switch replaces a traditional light switch in the house. With smart switches, you often not only operate the lighting, but also smart devices. When you purchase smart lamps, it's useful to include a suitable light button or dimmer. There are switches that you attach to a wall, but also switches that you take everywhere. The way the switch communicates with devices varies by product. Pay close attention to whether the switch can connect to the appliances and lamps in your house.