What is mostly used UML diagrams by a Business Analyst?

UML (Unified Modelling Language) depicts a clear view of what and how the system objects should behave and interact with each other in different states.

Below are UML diagrams that are mostly used by a Business Analyst,

1. Use Case - Use case diagrams model the functionality of a system using actors and use cases.
   
2. Class diagram - It is a static structure diagram that portrays the structure of a framework by showing the system's classes, their attributes, operations (or methods), and the relationships among objects.
   
3. Sequence Diagram - A sequence diagram depicts the interaction between objects in sequential order i.e. the arrangement in which these interactions take place.
4. Activity Diagram - An activity diagram visually presents a series of activities and the stream of control in a system.
5. Data Flow Diagram - A data flow diagram shows the way information flows through a process or system.
   
6. E-R Diagram - An entity-relationship diagram (ERD) shows the relationships of entity sets that are stored in a database.