What do you mean by the term Piggy Backing

What do you mean by the term Piggy Backing?

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The method termed piggybacking is used to enhance the efficiency of the bidirectional protocols. Whenever a frame is carrying data from A to B, it can as well carry control information regarding arrived (or lost) frames from B; whenever a frame is carrying data from B to A, it can as well carry control information regarding the arrived (or lost) frames from A.

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