MLD (Multicast Listener Discovery) Snooping is a technology used in IPv6 networks that is functionally similar to IGMP Snooping used in IPv4 networks. MLD Snooping monitors MLD traffic and directs multicast traffic to be sent only to those devices that are interested in it. In this way, MLD Snooping improves the efficiency and performance of IPv6 networks by minimizing unnecessary multicast traffic.