This Use Case diagram is referred to as a behavioral diagram in the UML that can describe the aims of the users and other systems that interact with the modeled system. They paint a brief but compelling picture of how a system, subsystem, or entity will be put to use and are used to describe its functional requirements. They are often supplemented by a list of NonFunctional Requirements and used in tandem with more general Business and Stakeholder Requirements. A Use Case diagram can depict the purpose of users or other systems' hopes to accomplish through using the system. Since they always come from the point of view of the Actors, the details of the Use Case will provide a more precise description of the objective.
