1. Authentication (AuthN)
Authenticates you. Are you really _You_? This is the part where the page asks you for your credentials (username+password, client-cert, &c) or the patrolman asks for your ID.
2.1. Authorization (AuthZ)
After establishing your identity (AuthN), determining if you can access the given resource or not. This is the part when the patrolman asks for your driving license.
2.2. Adjudication
If there are multiple AuthZ providers, the adjudicator decides which one takes precedence. This is the part when the patrolman weights pieces of information, like 1) you do have a driving license, 2) it is revoked or not, 3) you are disqualified or not, and 4) whether you are taking your sick grandma to the hospital or not.
