In SNMP, objects are identified by their unique object identifier (OID). An OID is a series of numbers separated by dots that identify the object in the object hierarchy. The OID is used by the SNMP manager to retrieve or set the value of the object. The OID is always associated with a specific variable, which represents the current value of the object. When the SNMP manager sends a request to the SNMP agent for a particular OID, the agent responds with the corresponding variable value.
