HomeKit is Apple’s software framework for home automation. Basically, it allows your iOS device to control multiple HomeKit-enabled smart devices within your home. That is — you can use your iPhone to turn off the HomeKit-enabled lights.
You use Siri voice commands to control accessories. So you can ask Siri to turn an appliance on or off.
Home automation – Home App
Home automation or smart home uses the concept of the Internet of Things (IoT) to connect devices to the Internet , that can be controlled via an app.
iOS 10 ‘Home’ will allow you to control all of the HomeKit enabled devices in one place. This Home app is meant for controlling HomeKit products. “Home” app will be available on the iPhone, iPad, and Apple Watch.
Some of the products that can be controlled by Home app,
for more information visit apple.com/ios/home