Smart homes automate and connect your household appliances, giving you more control than ever before. Everything is typically connected using WiFi, though it can also use radio protocols like ZigBee and Z-Wave. Another new option will be Bluetooth 5, which is said to be a potential technology for connecting smart home tech. With devices connected to the Internet, you can setup:
Remote control, for adjusting the thermostat from anywhere
Home automation based on schedules, motion, temperature, and more
Voice control using Alexa, Google Home, Siri, and others