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The OSI Model provides a method for understanding how end-to-end internet communications work. It deconstructs the networking process into seven layers, each representing a different step of the transmission chain. Each layer has its own function and is responsible for well-defined tasks. Most user data passes through each layer upon both ingress and egress.

Reference (Read More Here):

https://www.linode.com/docs/guides/introduction-to-osi-networking-model/