Layer 6: Presentation Layer
The Presentation Layer establishes context between Application Layer entities, in which the higher-layer entities may use different syntax
and semantics if the presentation service provides a mapping between them.
If a mapping is available, presentation service data units are encapsulated
into session protocol data units, and passed down the stack.
This layer provides independence from data representation
(e.g., encryption) by translating between application and network formats.
The presentation layer transforms data into the form that the application accepts. This layer formats and encrypts data to be sent across a network.
It is sometimes called the syntax layer.
The original presentation structure used the basic encoding
rules of Abstract Syntax Notation One (ASN.1), with capabilities
such as converting an EBCDIC-coded text file to an ASCII-coded file
or serialization of objects and other data structures from and to XML.
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