The OSI model breaks down how computers talk into seven organized steps. This makes it easier to understand how information travels from one screen to another.

The Seven Layer Concept

When you send a message, it travels from layer seven down to layer one. Each layer adds a 'wrapper' of instructions to help the message reach its goal.

Sending Data Down the Stack

When data arrives at your computer, it moves from layer one up to layer seven. Each layer removes a wrapper until only the original message is left for you to see.

Receiving Data Up the Stack

The Blueprint of Data

Layer 7 The Application

Layer 6 The Presentation

Layer 5 The Session

Layer 4 The Transport

Layer 3 The Network

Layer 2 Data Link

Layer 1 The Physical

Connecting the World

OSI Model Layers