When do we need to use in Use Case diagram
The in use case is used to modify the behavior of the base use case. Be that as it may, the base use case has no information about the expansion use case. An expansion use case can have one or a few behavioral groupings called segments that adjust the base use case. Each fragment expands the base use case at a particular expansion point famous within the base use case. Also, the condition beneath which the base use case is increased is characterized by the extension use case.
Example:
