The Open Systems Interconnection model (OSI model) is a conceptual model that characterises and standardises the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology.

Summary :

1. Application Layer – Firefox, Chrome, Email
2. Presentation Layer – OS (Letter and numbers) – like ASCII
3. Session Layer – conversation between two computers
4. Transport Layer – Packets are delivered reliably
5. Network Layer – Determine best route for data
6. Data-link Layer – Checking for errors (Network interface card(NIC) using in the layer)
7. Physical Layer – Cable, Fiberoptic, Ethical Signal

Reference - https://en.wikipedia.org/wiki/OSI_model

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