Synchronization has several subtly distinct sub-concepts:
Time offset synchronization
Time order synchronization
Two different time sequences may be synchronized in one sense without being synchronised in another, or synchronised at one time scale whilst being asynchronous in another.
Systems operating with all their parts in synchrony are said to be synchronous. Some systems may be only approximately synchronised, or plesiochronous.
For some applications relative offsets between events need to be determined, for others only the order of the event is important. The idea of simultaneity has many difficulties, both in practice and theory.
Whilst well-designed time synchronization is an important tool for creating reliable systems, excessive use of synchronization where it is not necessary can make systems less fault-tolerant, and hence less reliable.
Synchronization means never having to read the same feed twice!
One of the things that separates NewsGator apart from the competition is synchronization.
This feature makes sure your feeds follow you wherever you go, and makes sure you never have to read the same content twice whether you read that content online, on your mobile device or on a totally different platform.
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