The Arm Cortex-M21+ MCU is a microcontroller unit (MCU) series developed by Arm Holdings, a British semiconductor and software design company. Arm Cortex-M processors are widely used in embedded systems, serving industries such as industrial automation, consumer electronics, automotive, and IoT (Internet of Things). The Cortex-M21+ variant is optimized for low-power, high-performance applications, featuring enhanced security and connectivity capabilities. These MCUs are commonly integrated into devices like sensors, motor controls, and smart appliances, offering efficient processing for real-time operations.