HomeKit, also known as Apple Home, is a software framework developed by Apple Inc., made available in iOS and iPadOS that lets users configure, communicate with and control smart-home appliances using Apple devices. It provides users with a way to automatically discover such devices and configure them. By designing rooms, items, and actions in HomeKit, users can enable automatic actions in the home through a simple voice command to Siri or through the Home app. With HomeKit, developers are able to create complex applications in order to manage accessories at a high level. HomeKit is simply a communication protocol, which integrates and operates several types of accessories within the home. From Wikipedia
