Inter-Integrated Circuit

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Inter-Integrated Circuit

Not to be confused with I²S.

I2C, pronounced I-squared-C, is a serial bus that provides communication between sensors and microcontrollers such as the Arduino. In contrast to the full-duplex SPI specification, I2C has a slower data rate, and data can only travel in one direction at a time. Arduino uses 7-bit values to reference I2C addresses, and devices using I2C must use a common ground to communicate.

Source:

http://www.aeris.com/iot-dictionary/

References:

https://en.wikipedia.org/wiki/I²C

https://uk.wikipedia.org/wiki/I²C