There is a difference between smart systems and home automation.
While smart systems need the internet, home automation works with the electrical system.
A smart home enables home owners to manage appliances, thermostats, lights, and other gadgets remotely, using a smartphone or tablet, through internet.
Home automation is building automation for a home, called a smart home.
Lighting control, HVAC, outdoor lawn irrigation, kitchen appliances, and security systems are the most common applications of home automation.