The Arm Cortex-M421+ MCU is a microcontroller unit (MCU) based on the ARM Cortex-M4 processor core, developed by Arm Holdings, a British semiconductor and software design company. Arm Holdings is a global leader in processor IP, providing energy-efficient chip designs for a wide range of applications. The Cortex-M421+ MCU is designed for embedded systems, serving industries such as industrial automation, automotive, consumer electronics, and IoT (Internet of Things). It offers high performance, low power consumption, and real-time capabilities, making it suitable for applications requiring precise control and connectivity. The MCU is often integrated into devices like sensors, motor controllers, and smart appliances.