What is an error correction code (ECC) and why is it used?

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Grade: Education Subject: Support
What is an error correction code (ECC) and why is it used?
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An error correction code is a technique used to detect and correct errors that occur during data transmission or storage. ECC adds redundant information to the original data, allowing the receiver to identify and fix errors without requesting retransmission. It's crucial for reliable data storage (like RAM) and communication systems where errors are inevitable.