In the technology referred to as a message is divided into several parcels that can be routed independently to their destination.

Your answer is packet switching, hope I could help
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The four separate strokes are termed: ... While the piston is at T.D.C. the compressed air-fuel mixture is ignited by a spark plug (in a gasoline engine) or by heat generated through high compression, forcefully returning the piston to B.D.C.

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