what's the difference between password and passphrase

For private key file, it开发者_开发问答 requires to be encrypted using pass phrase. I am wondering is there any difference between password and pass phrase?

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Nothing is different beyond semantics. "Password" implies that you should use only one word while "passphrase" implies you can use multiple words. I have never seen a place where the strict meaning is enforced though, the two terms are usually completely interchangeable.

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As an example:

Password: abc@123!@#

Passphrase: This is the passphrase for CA.