Polydnaviridae is a virus which is found exclusively in Hymenoptera, a family of flying insects which include wasps, bees and ants. These viruses play a crucial role in the biology of these insects by helping them to counteract the immune responses of their hosts, which they parasitize. There are several synonyms for Polydnaviridae. These include Bracoviruses, Ichnoviruses, and Insect Parasitoid Viruses. All of these names refer to the same type of virus that co-evolved with parasitoid wasps, helping them to manipulate their hosts' immune systems to benefit their larvae. Polydnaviridae is an important area of study in virology, as it has opened up new fields of research, particularly around the co-evolution of viruses and their hosts.