Home automation systems use a computer to control various parts of a home, including lighting, appliances, and security systems. The goal is to automate day-to-day tasks such as turning on lights, adjusting the thermostat, and starting the coffeemaker. It can also be used to set up whole-house video and audio systems. All of the components are linked to a central computer, which may use buttons, touch screens, keypads, remote controls, or other devices. Virtually any part of a home can be controlled by an automated system.