Devices are connected as a ring and data passes the ring in one direction like bidirectional and regenerated signal can be accessed by the next device.
Advantage
It prevents collisions and traffic by using what is called as the token-ring method.
Disadvantage
It is high risk failure as the devices are connected point-to-point and even if a single device malfunctions it stops the functioning of the entire network.
There cables are costliest cable network to setup.
Ring topology is easy to maintain and troubleshooting is simple as location of faults is very easy.