Ø  Translation. The process(running programs) in two systems are usually exchanging  information in the form of character strings, numbers, and so on. The information should be changed to bit streams before being transmitted. Because different computers use different encoding system, the presentation layer is responsible for interoperability between these different encoding methods. The presentation layer at the sender changes the information from its sender-dependent into a common format. The presentation layer at the receiving machine changes the common format into its receiver. Dependent format.