| authentication | Authentication involves a user providing information about who they are. |
| authorization | Authorization follows authentication. During authorization, a user can be granted privileges to access specific resources. |
| accounting | Accounting keeps track of user activity. |
| ory | Company that creates and open sources security services. They also provide hosted solutions. |
| kratos | User Management and Authentication system. Open source and apache licensed. |
| authenticator assurance level (AAL) | NIST developed standard. AALs characterize the authentication strength of a digital identity. |