This little chip, called a microcontroller or processor, is the brains of the BBC micro:bit. It's what actually runs your programs.

This particular microcontroller is made by a company called Nordic Semiconductor and has the cryptic name of nRF51822. Did some one say Nerf? Wah? Meh, it's just what they call it. It's probably 'n' for Nordic, and 'RF' for radio frequency or something. Don't worry about.

You also don't need to know these details, but it's kind of fun to geek out about them:

• It's a 32-bit ARM Cortex M0 running at 16MHz
• It has 256KB of flash memory
• It has 16KB of ram
• It has a 2.4 GHz Bluetooth low energy radio