OSI models

The Open Systems Interconnect Model (OSI Model) describes all of the individual functions required for the Internet to work.

It is a set of seven independent functions that combine to achieve the ultimate goal of Computer to Computer communication.

Much like a car is made up of independent functions that combine to achieve the ultimate goal of moving the car forward: The battery drives the electronics, the alternator recharges the battery, the engine rotates the driveshaft, the shaft transfers the driveshaft's rotation to the wheels, and so on and so forth.

Each individual part can be replaced or worked on independently, and as long as each individual part is functioning properly, the car moves forward.

The OSI model is divided into seven distinct layers, each of which fulfills a very specific function. When combined together, each function contributes to enabling full computer-to-computer data communication.