ELI5: Explain Like I'm 5

Counternull

Counternull is a way to help protect your online accounts. It's like a secret code that only you know, so if someone tries to log into your account without the right code, they won't be able to get in. It's like a password but it's harder to guess because it's usually a mix of numbers, letters, and symbols. You use it instead of your normal password, so if someone tries to get into your account they won't be able to do it.
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