Aqara Hub is a HomeKit-enabled smart bridge. With the Aqara Hub, your iOS devices can control wall switches and RGB night lights, monitor temperature, humidity and atmospheric pressure, sense human movement, and detect water leaks.
With the Apple Home app, you can set up a home hub, remotely control your HomeKit-enabled accessories, give trusted people access, and automate the accessories to do what you need as required.
Automation can help do a lot of things. For example, turns off the light at 10pm every day; automatically turns off the air conditioner when you leave home; automatically turns on the corridor light; automatically turns on light when motion is detected. You will have to install a home hub first to set up the automation.