Intro to Home on iPhone
You can use the Home app to securely control and automate HomeKit-enabled accessories, such as lights, smart TVs, and thermostats.
When you set up supported security cameras, you can capture video, and receive a notification when a camera recognizes someone at your door or when a package is left at the door.
You can also open a compatible lock with a home key, group multiple speakers to play the same audio, and send and receive Intercom messages on supported devices.
With Home, you can control any Works with Apple HomeKit accessory using iPhone.

After you set up your home and its rooms, you can control accessories individually, or use scenes to control multiple accessories with one command.
To control your home automatically and remotely, you must have Apple TV (4th generation or later), HomePod, or iPad (with iOS 10.3, iPadOS 13, or later) that you leave at home. You can schedule scenes to run automatically at certain times, or when you activate a particular accessory (for example, when you unlock the front door). This also lets you, and others you invite, securely control your home while you’re away.
To learn more about how to create and accessorize a smart home with your Apple devices, tap Discover at the bottom of the screen.