it is the coordinated ordering of events. it means to control the flow of information data from one level to another in an orderly fashion with respect to time. the occurrence of simultaneous event is known as synchronisation.dedicated devices and parallel computing are the parameters that leads to the synchronisation. absolute synchronisation in multimedia communication system is different for different media, but it should not affect the presentation quality. synchronisation events have real time deadlines. failures to synchronise can be handled by methods like frame representation or skipping.