Anonymity
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What it is
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The complete disassociation of your online activity from your real identity — acting without a persistent identifier that could be traced back to you. Tor is a concrete example: it routes your traffic so you appear to browse from a random IP address and connection rather than your own.
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Why it matters
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Anonymity is often confused with privacy, but they solve different problems. Privacy is about controlling how your data is used and shared; anonymity is about severing any link between your activity and who you actually are. Some people — journalists and whistleblowers being the clearest case — need a threat model built around total anonymity, where even convenience is sacrificed because exposure could be life-threatening. Most people don't need to go that far, but understanding the distinction stops you from choosing the wrong tool for the wrong goal.
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Contrast with
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Pseudonymity — anonimity has no persistent identifier at all; pseudonymity has one, it's just not linked to your real name
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