The ARM Cortex-M is a family of microcontroller cores designed for low-power and cost-sensitive applications. It is widely used in embedded systems, such as IoT devices, wearable technology, and automotive systems. The Cortex-M architecture provides a balance of performance and energy efficiency, making it suitable for a variety of tasks. Cortex-M cores support a range of features, including a simple instruction set and low interrupt latency, which enhances real-time performance. They are often integrated with various peripherals and memory options, allowing developers to create versatile and efficient products. This architecture is popular among developers due to its ease of use and extensive ecosystem.