Circuit Playground Classic

Explain, in your own words, how the CPC works, what the demo program does, and a few sentences about how each of the sensors on the CPC work. In other words:

A. What is a microprocessor ? (at least 150 words)

B. What is Arduino? (at least 150 words)

C. What types of devices are they, how do they detect light, sound, etc.? (at least 200 words – can include images as well if they help)

Must include any references used!!