Intro to home automation
Home automation provides a way to run actions in your home based on events such as time of day, people arriving or leaving, or someone controlling an accessory. A normal shortcut requires you to run it from the Shortcuts app, the Shortcuts widget or the share sheet, whereas home automation actions use various home automation triggers to run from the home hub.
Home automation is synced to your home hub through iCloud. For more information, see the Apple Support article Set up your HomePod, Apple TV, or iPad as a home hub.