RNA-dependent RNA polymerase, also known as RdRP, replicase, or RNA replicase, is an enzyme responsible for the synthesis of RNA from RNA. This essential enzyme is required by many RNA viruses for viral genome replication, transcription, and virion assembly. Apart from these synonyms, RdRP is also known as RNA replicating enzyme, RNA replicating polymerase, RNA synthesis enzyme, RNA-dependent RNA synthase, and RNA replicative enzyme. These synonyms are important in the field of virology and molecular biology, as they are used to describe the functions of the RdRP enzyme in different contexts and serve as helpful resources for researchers studying RNA viruses.