Matter, formerly known as Project Connected Home over IP (CHIP), is a royalty-free connectivity standard developed within the Connectivity Standards Alliance, formerly the Zigbee Alliance. Matter runs on Thread and Wi-Fi® network layers and uses Bluetooth® Low Energy for commissioning. By providing a unified application layer based on proven technologies, manufacturers can leverage this open-source protocol to accelerate their development. Matter also improves compatibility for consumers and enables interoperability across the quickly expanding Internet of Things ecosystem so smart switches, smart hubs and smart thermostats from different manufactures can all work together in a home.
To get started with Matter, please refer to these SimpleLink Academies: Matter (ti.com)
Collectively, they will guide you through the necessary steps to setup, build, and develop for Matter applications.