What is RDBMS?

Relational  Data  Base Management  Systems  (RDBMS)  are  database management  systems
that  maintain  data  records  and  indices  in  tables.  Relationships  may  be  created  and
maintained  across  and  among  the data  and  tables.  In  a  relational database,  relationships
between  data  items  are  expressed  by means  of  tables.  Interdependencies  among  these
tables are expressed by data  values  rather  than by pointers. This allows a high degree of
data  independence.  An  RDBMS  has  the  capability  to  recombine  the  data  items  from
different files, providing powerful tools for data usage.