This picture is the best of all from tcpipguide.com and am posting it because it as the most detail visual information :
again tcpipguide.com is one of the best ressource out there for networking ressources .
The OSI model was created by the IEEE so vendors from different brand , would be able to communicate with each other.
There is 7 Layers :
Application
Presentation
Session
Transport
Network
Data Link
Physical
