Imagine your password is like a secret code you whisper to the computer. If you type it, the computer hears it clearly. But if you copy and paste it, sometimes it gets mixed up or has extra bits that confuse the computer. That’s why it might not work when you copy-paste instead of typing it yourself.
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See also
- What are passwords?
- What are long passwords with low entropy?
- How do passwords work the same way?
- What are dictionary attacks?
- What is A strong password is like a secret code that's hard to guess?