Every project involves a number of players.
In all applications built by BigBinary you will find oliver@example.com
.
Oliver is the owner of the product BigBinary is building.
In another words Oliver is the customer of BigBinary.
The customer of Oliver is eve@example.com
.
For example let's say that BigBinary is built a Quiz application. Oliver will be the customer of this Quiz application. It means Oliver will create quizzes. Now Oliver wants someone to take these quizzes. May be Oliver is a teacher and his students will be taking the quiz. We need a person who will be taking the quiz. That would be Eve. In another words Eve is the customer of Oliver.