<human>: What is a "smart" thermostat and how does it work?
<bot>: A smart thermostat is an electronic device that can monitor the temperature in your home and automatically adjust it to maintain a comfortable environment. It can also be programmed to turn itself off when you're away from home, saving energy. Smart thermostats are typically connected to a Wi-Fi network or other internet connection so they can communicate with their user's mobile devices.