Why HomeKit?

HomeKit is Apple's Smart Home framework connecting all your devices from around the home together in one app called Home no matter what manufacturer they come from. Through HomeKit you also have the option to control your devices through Apple's Siri and away from home through the Apple TV 4. 

Source: Apple's HomeKit TV Advertisement 

What devices can be used with Apple HomeKit?

Over 50 brands worldwide are committed to providing accessories that are compatible with the HomeKit framework, and the number available is growing every day. And each of these accessories is reviewed and approved by Apple to help ensure your security when you use it.

Lights Switches Outlets Thermostats  Windows
Fans Air Conditioners Humidifiers Air Purifiers Sensors
Security Locks Cameras Doorbells Garage Doors
Bridges Range Extenders

Siri makes your voice the on/off switch.

Siri knows the types of HomeKit-enabled accessories you have in your home as well as their status. So you can ask Siri to turn an appliance on or off, dim your lights, or set one of your scenes. With Apple TV, you don’t even have to be home — for example, you can ask Siri to set the “I’m Home” scene while you’re driving. When you get there, your house will be bright and warm, waiting for you to settle right in.

Possible Siri Commands: 

“Turn on the 
upstairs lights”
 “Set the house 
to 72 degrees”
“Is the front door locked?”
“Set my Bedtime scene” “Show me the 
outdoor camera”
“Movie Night”


Read more about Apple HomeKit at Apple's Website - Link