What is the difference between star topology and mesh topology ?

 What is the difference between star topology and mesh topology ? 

In the star topology :

star topology

• In a star topology, each device has a dedicated point-to-point link only to a central controller  usually called a hub.
• The devices are not directly linked to one another. Unlike a mesh topology.
• a star topology does not allow direct traffic between devices.
• The controller acts as an exchange:
•  If one device wants to send data to another, it sends the data to the controller, which then relays the data to the other connected device .
• A star topology is less expensive than a mesh topology.
•  In a star, each device needs only one link
• and one I/O port to connect it to any number of others.

In a mesh topology :

Mesh Topology 

• every device has a dedicated point-to-point link to every other device.
• The term dedicated means that the link carries traffic only between the two devices it connects.

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