The Free On-line Dictionary of Computing (30 December 2018):

application layer
layer 7

    The top layer of the OSI seven layer model.
   This layer handles issues like network transparency,
   resource allocation and problem partitioning.  The application
   layer is concerned with the user's view of the network
   (e.g. formatting electronic mail messages).  The
   presentation layer provides the application layer with a
   familiar local representation of data independent of the
   format used on the network.

   (1994-11-28)