1、In networking, a communications transmission in which multibyte packets of data are sent and received at a fixed rate. 2、In networking, the matching of timing between computers on the network, to facilitate and coordinate communications. 3、In a computer, the matching of timing between components of the computer so that all are coordinated. For instance, operations performed by the operating system are generally synchronised with the signals of the machine's internal clock. 4、In application or database files, version comparisons of copies of the files to ensure they contain the same data. 5、In multimedia, precise real-time processing. Audio and video are transmitted over a network in synchronisation so that they can be played back together without delayed respo.