PRESENTATION LAYER-WELCOMEITBOOK

PRESENTATION LAYER
This layer is very much important for the formatting of information and delivery of information 

The presentation layer is responsible for the delivery and formatting of information to the application layer for further processing or display. An example of a presentation service would be the conversion of an EBCDIC-coded text computer file to an ASCII-coded file

This layer is very important for the proper functioning a neat and correct working of a computer network

The presentation layer is the lowest layer at which application programmers consider data structure and presentation, instead of simply sending data in form of datagrams or packets between hosts. This layer deals with issues of string representation - . The idea is that the application layer should be able to point at the data to be moved, and the presentation layer will deal with the rest.Encryption and Decryption are two very much important aspects related to Presentation lay;er

Encryption is typically done at this level too, although it can be done on the application, session, transport, or network layers, each having its own advantages and disadvantages. Decryption is also handled at the presentation layer. For example, when logging off bank account sites the presentation layer will decrypt the data as it is received.^[1] Another example is representing structure, which is normally standardized at this level, often by using XML. As well as simple pieces of data, like strings, more complicated things are standardized in this layer. 

In many widely used applications and protocols, no distinction is made between the presentation and application layers. For example,HyperText Transfer Protocol (HTTP), generally regarded as an application-layer protocol, has presentation-layer aspects such as the ability to identify character encoding for proper conversion, which is then done in the application layer.

Within the service layering semantics of the OSI network architecture, the presentation layer responds to service requests from the application layer and issues service requests to the session layer.

In the OSI model: the presentation layer ensure the information that the application layer of one system sends out is readable by the application layer of another system. For example, a PC program communicates with another computer, one using extended binary coded decimal interchange code (EBCDIC) and the other using ASCII to represent the same characters.