To better understand the field of Fine-Grained Authorization (FGA) we've summarized all the required terms in one place.

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Subjects

An actor that requires access to a resource. It can be a User, Api token, User token, Access token.

Each request is sent with a context, usually in the form of a JWT token. That token represents the Subject.

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Assets/Resources

Any custom data that you own. It can be Pages, Environments, Eggs or anything else that your software handles

Assets or resources can be used interchangeably.
A subject can access an Asset