It is the fifth of seven layers of the ISO/OSI model concerned with network management functions including passwords and network monitoring and reporting.It coordinates communication between systems, and serves to organize their communication by offering three different modes: simplex, half duplex, and full duplex.

In other word, It is a set of rules for establishing and terminating data streams between nodes in a network. The services that this layer can provide include establishing and terminating node connections,
message flow control, dialogue control and end-to-end data control.

• The Session layer is responsible for setting up, managing, and then tearing down sessions between Presentation layer entities.
• It coordinates communication between systems, and serves to organize their communication by offering three different modes: simplex, half duplex, and full duplex.
• The Session layer basically keeps different applications’ data separate from other applications’ data.
• Examples of Session Layer : RPC, SQL, NFS and NetBIOS .

Session layer is offering three different modes,

simplex,half duplex and full duplex . Simplex communication is a one way traffic communication eg. Radio. Half duplex communication have both
both side communication but at a we can use only single side like polce walky talky . Full duplex communicaiton is a full way communication like internet, computer networking and telephon