The OSI model (Open System Interconnection) defines a computer network framework for implementing protocols at seven layers. A protocol in networking terms is a form of negotiation and rule between two networking organizations. The purpose is to define how communication between the two computers will be.

The OSI is a conceptual model that characterizes and standardizes the communication functions of a telecommunications or information processing system, regardless of its underlying internal structure and technology, and its purpose is the interoperability of various communication systems with standard protocols.

In simpler words, the OSI model is a tool used by IT professionals to actually model or monitor the actual flow of data transfer across networks. So basically the OSI model is a logical representation of how network systems should send data to each other.

The OSI Model divides this data communication procedure into different components. Its purpose is to guide vendors and developers so that the digital communication products and software programs they create can work together and facilitate clear comparisons between communication tools. Most vendors involved in telecommunications attempt to describe their products and services in relation to the OSI standard.

Moreover, it is very important for an IT professional to have a clear idea of the OSI Model. This is because they can narrow down and find out what part of the problem is using OSI Layers in case of certain network issues. That's why it's very useful to have an OSI Layered approach to troubleshooting networking issues.

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