Your tado° can be either in Home or Away Mode.
Your tado° is in Home Mode when a smartphone is detected to be within the home area or when you have turned off Location-based Control for a time block. When you let tado° automatically determine the optimum Away Temperature, it ensures that your home is already at the right temperature when you get there by preheating or precooling as you approach your home.
While no one is at home you may want to reduce the temperature in your house to save energy. tado° does this for you by detecting when the last person leaves the house and activating the Away Mode. You can either leave it up to tado° to determine the ideal Away Temperature or set a certain temperature for the time when you are not at home.