It seems like you're referring to the NodeMCU, which is an open-source firmware and development board based on the ESP8266 Wi-Fi module. The NodeMCU development board provides an easy-to-use platform for IoT (Internet of Things) projects and prototyping. NodeMCU boards provide a convenient and cost-effective platform for IoT prototyping and development, offering built-in Wi-Fi connectivity, GPIO pins, and compatibility with popular programming languages and development environments.
