An ARM microcontroller is a small computing device that uses an ARM architecture to perform various tasks in embedded systems. These microcontrollers are designed to be energy-efficient, making them ideal for battery-powered applications. They integrate a processor core, memory, and peripherals on a single chip, allowing for compact designs in products like smartphones, appliances, and automotive systems. The ARM architecture is widely used due to its versatility and performance. It supports a range of applications, from simple control tasks to complex processing. Many manufacturers produce ARM microcontrollers, providing developers with a variety of options to suit different project requirements.