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The purpose of this document is to define terminology used through this documentation.


The person who actually uses a particular product that uses Ory Kratos.


the "who" of a software system. It can be a customer, employee, user, contractor, or even a programmatic identity such as an IoT device, application, or some other type of "robot."

Common aliases are "user", "user account", "account", "subject".


Interfaces and flows allowing customers to produce services independent of involvement of direct service employee.

You perform self-service registration when signing up for a new Google account, because no one else is involved in the process.