[3] Database Management System (DBMS) :

 Database is sensibly intelligible  mobile database assortment of information with some natural importance. An arbitrary grouping of information can not be said as database. For example, a Telephone Diary is additionally a database, yet, in the event that it is haphazardly put away, at that point, it can not be said as database. 

Database can be created physically or in automated way. The Library inventory is likewise a database.