Saltatory conduction is the process by which an action potential travels down an axon by jumping between the nodes of Ranvier. The presence of myelin sheaths prevents sodium channels from being present in the internodal region, but the myelin helps conduct the depolarization signal along to the next node. Due to saltatory conduction, an action potential travels faster down a myelinated axon than down an un-myelinated axon.
(“Saltatory conduction”, 2016)