MultiProtocol Label Switching

Definition
MultiProtocol Label Switching (MPLS) is

"[a] standard from the Internet Engineering Task Force (IETF) for including routing information in the packets of an IP network. Used to ensure that all packets in a particular flow take the same route over a backbone. Deployed by many telecommunications and service providers, MPLS delivers the quality of service required to support real‐time voice and video as well as Service Level Agreements that guarantee bandwidth. Large enterprises may also use MPLS in their national networks."