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If 10,000 people all upload a file named image.png to the same server, the computer would get confused. By giving every single file a unique 128-bit number, the odds of two files having the same name are virtually zero.

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Sometimes, original file names contain personal info or metadata. A UUID acts as a "blank slate" that keeps the backend organized without revealing what was on the user's desktop. If 10,000 people all upload a file named image