Circuit Playground is the name of the little round electronic circuit board that you are going to use as a tool to investigate and explore programming & electronics. Think of it as like a Swiss Army Knife or multi-tool for learning electronics as an art form! It is an all-in-one board so you can jump in quickly and do a whole lotta projects (It can slice, it can dice, it has lots of blinky LEDs!)
Meet LadyAda, the founder of Adafruit.
Interested in the the technical specifications of this micro controller? This short video from Core Electronics goes over all the components and what you can do with them.