Embedded microcontrollers are specialized ICs that combine a microprocessor core with memory, input/output peripherals, and other essential components on a single chip. They are designed to perform specific tasks within electronic systems, such as controlling devices, processing data, and interfacing with external sensors or actuators. Basic microcontrollers with lower processing power and limited features can be relatively affordable, ranging from a few dollars to tens of dollars per unit. However, high-performance microcontrollers with advanced features, extensive memory, and specialized peripherals may cost more. When purchasing embedded microcontrollers, evaluate the processing power and memory capacity based on your application's computational and storage needs. Look for essential peripherals like ADCs, DACs, communication interfaces (UART, SPI, I2C), and general-purpose input/output pins (GPIO) for interfacing with external devices. Consider the programming environment and toolchain compatibility, as well as available software libraries and development support.