It is the sixth of seven layers in the OSI model concerned with protocols for network security, file transfers, and format functions.It is mainly responsible for how the data is to be presented to the Application Layer.

Points to Remember:

• Tasks like Translation, Encryption, decryption, compression,decompression are associated with this layer.
• Protocols at this layer take care of manipulation tasks that transform data from one representation to another, such as translation, compression and encryption.
• It is used much less often than the other layers , in many types of connections it is not required.
• It receives the data in native format & converts in standard format or receives data in standard format and converts in native format.
• It is mainly responsible for how the data is to be presented to the Application Layer.
• Examples are  MIDI, MPEG, GIFF , PICT, TIFF, JPEGetc.