Also see Web ring.
A ring is a network topology or circuit arrangement in which each device is attached along the same signal path to two other devices, forming a path in the shape of a ring. Each device in the ring has a unique address. Information flow is unidirectional and a controlling device intercepts and manages the flow to and from the ring. The token ring is the most prevalent form of ring network.
Dig Deeper on LANs (Local Area Networks)