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I know I can't send coin without my passphrase, but I have forgotten it. All I would like to know is, is the passphrase a phrase I come up with? Or does Bitcoin Core provide the phrase? Many thanks.

Also is it just one word or a sequence of words?

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is the passphrase a phrase I come up with?

Yes.

It is used to encrypt the wallet so that only you can use it.

is it just one word or a sequence of words?

It is up to you what characters to type and whether it includes spaces.

The program suggests "Please use a passphrase of ten or more random characters, or eight or more words" So, if you are the sort of person to heed advice, you probably chose a passphrase following one or the other of those forms.

I have forgotten it.

See Are there Bitcoin password crackers I can use to recover forgotten passwords?

Don't use any online tools.

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