What is the main responsibility of the Transport layer in the OSI model?

The main responsibility of the Transport layer in the OSI model is to facilitate end-to-end communication and ensure reliability between devices on a network. This layer is crucial for managing how data is transferred across the network, establishing connections, and maintaining the flow of information. It provides services such as error detection and correction, flow control, and segmentation of data into packets for easier management during transmission.

By ensuring that data packets are delivered accurately and in the correct order, the Transport layer enables reliable communication between applications running on different devices. Protocols that operate at this layer, such as TCP (Transmission Control Protocol) and UDP (User Datagram Protocol), help determine how data should be sent and retransmitted in case of errors or network interruptions. This directly contrasts with the responsibilities of other layers, which focus on aspects like data formatting, local network connections, and routing between various networks.