Data base System - Bangladesh Railway System , Rokomari
Comprised of two things

1. Database Database is a collection of related data . Rokomari own database . After log in we get information about books . It gives us data related to books only . Structured Data Follows particular structure Unstructured Data No particular Structure. Ex - Photos , Videos , Webpage . Have no particular format . Database is of structured data . Operations - Insertion , Deletion , Updation

It does collection of operation

*Relation *
Data is stored with relation .

Excel sheet

What is DBMS ?
A management system . It do so many operations . Like Deletion , Insertion .