is an open-source, industry-unifying connectivity standard for smart home devices
developed by the Connectivity Standards Alliance (CSA) - a group including industry giants like Apple, Google, Amazon, and Samsung
it is designed to ensure that smart home devices from different manufacturers can communicate with each other locally, securely, and reliably

Where it Lives in the OSI Model

OSI Layer	Matter’s Role
Layer 7 - Application	Defines the “business logic” (e.g., “turn on,” “set temperature,” “lock door”).
Layer 6 - Presentation	Handles data formatting, encryption (CASE/PASE protocols), and serialization.
Layer 5 - Session	Manages the secure exchange and relationship (Fabric) between Matter devices.

Other