OSI MODEL

The Open Systems Interconnection (OSI) model was created by theInternational Organization for Standardization (ISO), the world's largest developer of voluntary international standards. It is a layered model that was created to enable different networks to communicate reliably between disparate systems. The OSI model provides a framework for creating and implementing networking standards and devices and describes how network applications on different computers can communicate through the network media.

The OSI model has seven hierarchical layers. Each layer describes a different network function. The layers are:

Application, Presentation, Session, Transport, Network, Data Link, Physical  Also.