In other words, this layer provides human-computer interaction, such that the web browsers or email clients applications rely on it to ensure communication. It is the only layer that involves direct interaction with the data from the end-user. Let us discuss all of the layers and their properties in a ‘top down’ manner. Each layer performs its own set of tasks and communicates with the layers above and below it to carry out successful network transmission. The OSI model is divided into seven layers to represent network architecture. The OSI 7-layer model is still used to visualize the basic essential networking architecture and troubleshoot problems. Even though the internet these days is based on a simpler networking model, TCP/IP. It was introduced by the Internet Organisation of Standards in 1984 when computer networking was only becoming a new concept. The model defines a set of rules and regulations required to render interoperability between different software and devices. In the 1980s, the model was a globally accepted standard framework for network communication. The Open System Interconnection (OSI) model conceptually illustrates seven abstraction layers of communication framework that devices use for interoperability over the network.
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