What is the purpose of the session layer in the OSI model?

The functionality is quite extensive,it handles dialogue manage,ent between programs such as access control and synchronization.It will also manage up$,$maintenance and session teardown of the session communication channels and in some cases,communication can also take place here.Some of the protocols that work on this layer include NFS$,$RPC and SQL

The functionality at this layer would enable the protocols to communicate to applications on remote systems.Some of the protocols that function at this layer include SMTP$,$LDAP and HTTP

There are no protocols that work at this layer,only services and the layer is concerned with the syntax of the data making sure that it is in a standardized format.You will also see things like encryption and compression operate at this layer.

The functionality of this layer primarily has to do with the routing of packets