What is micro:bit?

The BBC micro:bit is a pocket-sized computer that introduces you to how software and hardware work together. It has a LED light display, buttons, sensors and many input/output features that you can program and physically interact with. The latest micro:bit adds sound sensing and playback capabilities. It has been created and developed by the Micro:bit Educational Foundation. 

It is more than a microcontroller because it includes input and output devices like buttons and a LED display as well, making it more like a computer.

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Speaker to play back sounds and melodies and make some noise!

Microphone to respond to sounds. A microphone LED, lets you know when the microphone is in use.

25 red LED lights that can flash messages and be used to create games. They can act as light sensors too.

  Two programmable buttons that can be used to control games or pause and skip songs on a music playlist.

 Accelerometer to detect motion and know when you're on the move.

 Built-in compass to know which direction you're heading in.

 Radio and Bluetooth transmitter and receiver to let you interact with mobile devices wirelessly.

A range of input and output pins to let you connect the micro:bit to other devices via it’s Edge Connector

 A temperature sensor (ºC) integrated in its microprocessor.

Information extracted from here