The Transport Layer (Layer 4 of the OSI model) is responsible for end-to-end communication, error handling, and flow control between devices.

Elaboration:

• Uses TCP (connection-oriented) and UDP (connectionless) protocols.
• Ensures data integrity through error checking and retransmission (TCP).
• Manages segmentation and reassembly of data.

Example:

When loading a website, the Transport Layer ensures that all TCP packets are received and reassembled in the correct order.