The Arm Cortex-M420+ MCU is a microcontroller unit designed by Arm Holdings, a British semiconductor and software design company. It serves industries such as industrial automation, consumer electronics, and IoT, offering energy-efficient, high-performance processing for embedded systems. The Cortex-M420+ is part of Arm's Cortex-M series, known for its real-time capabilities and low power consumption, making it ideal for applications requiring reliable and efficient computing.