Lecture 5 - UML USE CASE Diagrams (മലയാളത്തിൽ) 

Use case diagrams present an outside view of the manner the elements in a system behave and how they can be used in the context.
Use case diagrams comprise of −
• Use cases
• Actors
• Relationships like dependency, generalization, and association
Use case diagrams are used −
• To model the context of a system by enclosing all the activities of a system within a rectangle and focusing on the actors outside the system by interacting with it.
• To model the requirements of a system from the outside point of view.