Session Layer

The Session Layer is the fifth layer of the OSI model and is responsible for establishing, managing and terminating communication sessions between applications running on different systems. It coordinates the dialogue between communication partners and can control when and how data is exchanged. Its functions also include session management and the synchronisation of longer data transfers. Defined synchronisation points can allow interrupted communication processes to resume under certain conditions without restarting the entire data transfer. The Session Layer is positioned between the Transport Layer and the Presentation Layer and supports structured communication between applications across a network infrastructure.