STM MCU boards, also known as STM32 microcontroller unit boards, are powerful and versatile development platforms designed by STMicroelectronics. These boards feature STM32 microcontrollers, which are based on ARM Cortex-M cores and offer a wide range of peripherals and features. STM MCU boards provide an ideal environment for prototyping, developing, and debugging embedded applications, making them a popular choice among electronics enthusiasts, hobbyists, and professionals.