There is a TWI (Two Wire Interface) port available on the Wiring board named Wire. The port Wire is available on the Wiring I/O pins 0(SCL) and 1(SDA).

Wire
Wiring TWI port available on pins 0 and 1.

beginTransmission()
Starts data transmission to the specified device.

endTransmission()
Marks the end of a transmission to a device.

begin()
Initiates the TWI as a Master or a slave using the address specified.

onReceive()
Set the function that executes whenever data is received as a slave device.

onRequest()
Set the function that executes whenever data is requested by a master from this device.

receive()
Returns a byte received from a device.

requestFrom()
Start reading a specified number of bytes from the device specified with a given address.

available()
Returns the number of bytes available.

send()
Sends data to a device.