authentication

Also known as "authn". Describes who a person is.

e.g.

this user's name is Dan Conley
this user's user id is 413
this user's email is dconley@acvauctions.com
this user is a member of the Magnacar dealership
this user is in the ACV Employees group
this user is in the Engineering group
this user is in the Business Operations Engineering group