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?

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.

As an example:

Password: abc@123!@#

Passphrase: This is the passphrase for CA.