(Solved): Need help explaining a data flow diagram and a use case diagramon the Library management system.DATA ...

Need help explaining a data flow diagram and a use case diagramon the Library management system.

DATA FLOW DIAGRAM (DFD) ?ook search Display REPORTS Student Display Command data status Reserve Store details Student data Reserve Command data Modify/Maintain Insert Student Display Update Issue Issue status Handle Command data Collect details Command Return Update Issue Return ???KS LIBRARY STAFF Use Case Diagram Login Renew book Search for book Student Librarian Check out book Reserve book Add book Return book Delete book Check Account Edit book /title Report invalid IDs Show transcribed image text DATA FLOW DIAGRAM (DFD) ?ook search Display REPORTS Student Display Command data status Reserve Store details Student data Reserve Command data Modify/Maintain Insert Student Display Update Issue Issue status Handle Command data Collect details Command Return Update Issue Return ???KS LIBRARY STAFF Use Case Diagram Login Renew book Search for book Student Librarian Check out book Reserve book Add book Return book Delete book Check Account Edit book /title Report invalid IDs