what is I2C,
what is its application.??

I2C EEPROM Board
I2C Clock Board
I2C A2D Board

what are these things??

 

http://en.wikipedia.org/wiki/I²C

 

I2C is an interface between a processor and one or more peripheral devices.

EEPROM is Electrically Erasable Programmable Read Only Memory
Clock implements a Time of Day Clock
A2D is an Analog to Digital converter

 

Homework.