Answer Posted / neha

synchronization of processes, and synchronization of
data.Process synchronization refers to the idea that
multiple processes are to join up or handshake at a certain
point, so as to reach an agreement or commit to a certain
sequence of action.Data synchronization refers to the idea
of keeping multiple copies of a dataset in coherence with
one another, or to maintain data integrity.

more detail answer at
http://www.edugoing.com/qna/index.php?qa=94&qa_1=what-is-synchronization-in-respect-to-multi-threading
i think it will help you

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