The Raspberry Pi’s success defied expectations. Conceived as an affordable computer for getting kids to learn how to code, its creators thought they’d sell 1,000. They’ve sold more than 25 million. Here’s why.

From the cheat sheet:

WHAT IS THE RASPBERRY PI?

A credit card-sized computer that went on to become the best-selling UK computer of all time.

Key to the Pi’s success has been its price. It’s not the most powerful machine in the world, but for the less than $60 it offers a computer that can be used to build homebrew electronics and put together programs on a budget.

The charitable foundation behind the Pi hasn’t rested on its laurels, upgrading the Pi’s specs three times since launch, while keeping the price at $35 – $55. In that time, the Pi’s processing power has grown more than