Is there any difference between uml diagram and a use case diagram ? Since both the diagrams are made differently but both show the same information
I think you are getting confused with the UML and use case.
UML contains different diagrams and Use case is one of it. Use Case diagram defines Behavioural component of Software Design i.e. Actor communicating with the system through Task - Use Case.
UML also contains Structural diagrams as well as - such as Class Diagram.
From what I can understand UML is a superset and USE case is subset.