In the trailer department we carry Jet Co, Haulass, and Dynaweld. We also have an assorted inventory of used cars, Ford, Chevy, Mercury, and GMC, Volkswagen, Honda, Dodge and Nissans, Trucks, Vans and SUVâs.
In short, please. :-). Authentication = login + password (who you are). Authorization = permissions (what you are allowed to do). Short auth is most likely to refer either to the first one or to both.
1 Authentication is used by a server when the server needs to know exactly who is accessing their information or site.  Authentication is used by a client when the client needs to know that the server is system it claims to be.