Why is off-chain transaction used?

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Blockchain is said to provide more security for data. Then why some transactions of Blockchain happen off-chain?
Feb 12 in Blockchain by Raghu
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1 answer to this question.

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Though on-chain transactions secure data, off-chain transactions are used mainly to protect the privacy of the data and that's why it is made between two trusted parties and is not visible to the public. And because these transactions do not need validation or verification by other nodes or miners, it is cheaper and faster.
answered Feb 12 by Omkar
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