What is "ioio"

IOIO (pronounced yo-yo) is a series of open source PIC microcontroller-based boards that allow Android mobile applications to interact with external electronics. The device was invented by Ytai Ben-Tsvi in 2011, and was first manufactured by SparkFun Electronics. The name "IOIO" is inspired by the function of the device, which enables applications to receive external input ("I") and produce external output ("O").