A virtual audio cable is a software program that allows you to route audio signals between different applications on your computer. This can be useful for a variety of purposes, such as recording audio from one application and playing it back in another, or sending audio from one computer to another over a network.
Virtual audio cables offer a number of advantages over traditional hardware cables. They are more flexible and portable, and they can be used to create complex audio setups that would be difficult or impossible to achieve with hardware cables. Additionally, virtual audio cables are often less expensive than hardware cables.