Question

what is collision? when it happens????​

Answer 1

Explanation:

A collision is the situation that occurs when two or more devices attempt to send a signal along the same transmission channel at the same time. The colliding of the signals can result in garbled, and thus useless, messages

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Answer 2

COLLISION :- A collision is the event in which two or more bodies exert forces on each other in about a relatively short time.

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