The OSI (Open Systems Interconnection) model and the TCP/IP (Transmission Control Protocol/Internet Protocol) model are both conceptual frameworks used to describe how data is transmitted over a network. While they both serve the same purpose, there are some key differences between the two models.

The OSI model is a seven-layer model that describes how data is transmitted between devices on a network. Each layer of the OSI model has a specific function and communicates with the layers above and below it. 

The seven layers of the OSI model are:

Physical Layer
Data Link Layer
Network Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer

On the other hand, the TCP/IP model is a four-layer model that describes how data is transmitted over the internet. 

The four layers of the TCP/IP model are:

Network Access Layer
Internet Layer
Transport Layer
Application Layer


The key difference between the two models is that the OSI model is a theoretical framework that provides a detailed description of how data is transmitted over a network, while the TCP/IP model is a practical implementation of this framework that is used in the actual operation of the internet. While the OSI model is still used for educational and theoretical purposes, the TCP/IP model is the de facto standard for networking in the real world.
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