Ecosystem
The ecosystem is the user-facing control environment such as Apple Home, Google Home or Alexa.
Application protocol
Matter is an IP-based application-layer standard designed for interoperability across participating ecosystems.
Network transport
A Matter device can use supported IP networking such as Wi-Fi or Thread; Bluetooth Low Energy is commonly involved in commissioning.
Manufacturer services remain relevant
Firmware, advanced features, account services and diagnostics can still come from the device maker.
Keep in mind. Compatibility is not permanent. Confirm the current manufacturer, platform and certification information before purchasing, resetting or migrating a device.