The OSI model shows how computers send data to each other in seven simple steps. The Physical layer is the wires or Wi-Fi that carry signals. The Data Link layer moves data between nearby devices. The Network layer finds the best path to send the data. The Transport layer makes sure the data arrives safely. The Session layer keeps the connection open while they talk. The Presentation layer makes the data readable. The Application layer is what you use like a browser or email. All these layers work together so computers can share information easily.
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