In this video, you’ll learn about the Transport Layer (Layer 4) of the OSI model and its role in end-to-end communication between applications. The lesson explains how data is broken into segments, how it is reassembled at the destination, and how port numbers help direct traffic to the correct application.

You’ll also understand the difference between TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). TCP is connection-oriented and reliable, using acknowledgements, sequencing, and flow control to ensure accurate delivery, while UDP is connectionless and faster, often used for real-time applications like streaming and gaming.

By the end of this video, you will clearly understand how the Transport Layer provides reliability, error control, flow control, and proper application addressing, making it one of the most important layers of the OSI model.