Overlay networks

An overlay network is a virtual or logical network built on top of an existing physical network. It creates a new layer where devices connect through virtual links, allowing for specialized functions like improved security, routing, or data sharing. Think of it as a private communication channel layered over the existing internet infrastructure, enabling advanced features without altering the underlying physical connections. These networks are used in technologies like VPNs, peer-to-peer services, and content delivery networks to enhance performance, privacy, or reliability.