The SNMP Management Information Base (MIB) [SNMP]

A Management Information Base (MIB) describes a set of managed objects. An SNMP management console application can manipulate the objects on a specific computer if the SNMP service has an extension agent DLL that supports the MIB.
Each managed object in a MIB has a unique identifier. The identifier includes the object's type (such as counter, string, gauge, or address), the object's access level (such as read or read/write), size restrictions, and range information.