The System Management Bus is a single-ended simple two-wire bus for the purpose of lightweight communication. The SMBus was defined by Intel and Duracell in 1994. The System Management Bus (SMBus) is a two-wire interface through which various system component chips can communicate with each other and with the rest of the system. The System Management Bus (SMBus) is more or less a derivative of the I2C bus. I²C bus and the SMBus are popular 2-wire buses that are essentially compatible with each other. Short for System Management Bus, the SMBus or sm bus controller was first developed by Intel in 1995 as a split from I2C.