When you come home and the lights turn on automatically, or the thermostat adjusts because it detected you left... that's not magic. That's automation.
Automation is simply an instruction that runs by itself when certain conditions are met. "IF X happens, THEN do Y".
What do you need for a smart home?
You only need three things: sensors (that detect something), a control system (that processes the info), and actuators (that execute the action). Your phone can act as the control system.
Smart bulbs
Controlled by app or voice. Can be scheduled by time or react to your presence at home.
Smart thermostat
Learns your habits and adjusts temperature automatically. Can save you up to 20% on your energy bill.
Robot vacuum
Maps your home, avoids obstacles, and cleans on schedule. No need for you to be present.