In official terms, Name ID is a SAML concept which identifies the subject to whom the SAML Assertion relates to.

To give more context, NameID contains several attributes. The most important ones are its VALUE (example: joe@bloggs.com) and the format in which it's delivered.

NameIDFormat is used so that the Service Provider doesn't have to guess how to utilise the value of NameID.

>> Hello Application, here is (joe@bloggs.com) as a user identifier, it is in email format, good day!

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