The System Management Bus (abbreviated to SMBus or SMB) is a single-ended simple two-wire bus for the purpose of lightweight communication. Most commonly it is found in computer motherboards for communication with the power source for ON/OFF instructions. SMBus is used as an interconnect in several platform management standards including: ASF, DASH, IPMI. SMBus is used to access DRAM configuration information as part of serial presence detect. SMBus has grown into a wide variety of system enumeration use cases other than power management.