Which description best defines a microcontroller?

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A microcontroller is a small computer on a single integrated circuit that includes a processor core, memory, and programmable input/output peripherals. This high level of integration lets it handle dedicated control tasks in embedded systems, since it has everything needed on one chip to process instructions, store data, and interact with sensors and actuators. Unlike a plain CPU or processor that often needs separate memory and peripherals, a microcontroller combines these elements, making it compact, cost-effective, and energy-efficient for real-time control. The other descriptions don’t fit: one describes a CPU with a heat and sound sensor, which isn’t how microcontrollers are defined; another is vague about “portable circuits” making other circuits; and the last mentions a material (silver) rather than function.