The full form of DBMS and RDBMS is a Database Management System and Relationship Database Management System respectively. Both of them are used to store data or information in a physical database. DBMS can define, create, manipulate and control the database according to the requirements. Some examples for DBMS are Windows Registry, XML etc. On the other hand, RDBMS is an advanced version of DBMS and it is capable of managing data more efficiently than DBMS. Some example for RDBMS is Oracle, MYSQL, SQL Server etc. Let us compare various characteristics of  DBMS vs RDBMS for our better understanding:

Parameters DBMS RDBMS
Form of storage This software stores data as a file It stores data in table format
Structure of the database In this system, data is stored either in hierarchical or in navigational form Here the rows of the table reflect the values of data. The rows of the tables have a primary key which works as an identifier
The number of total users at a time It can be used by only one user at a time The RDBMS can be used by multiple users at a time.
Normalization Normalization is not available in this system. Normalization is one of the most important features of RDBMS
Data consistency In DBMS data is not always stored according to the ACID Model (Atomicity, Consistency, Isolation, and durability). Hence inconsistency might occur in the database. This system strictly follows the ACID Model. Hence there is less scope for data inconsistency in the database.
Data integrity Integrity constraints are not supported by this system. Integrity constraints are supported at the schema level by this system.
Distributed database Distributed database is not supported by this system Distributed database is not supported by this system
Utilization DBMS is mostly used for managing a small amount of data RDBMS is mostly used to manage a large amount of data
The relationship between the tables As the file system is used to store data in DBMS, there is no relationship between two different tables in this system. As data is stored in a tabular form in RDBMS, there is a relationship between two data values. This relationship is again stored in a tabular form.
Client-server The client-server architecture is not supported by this system The client-server architecture is supported by this system
Data redundancy Data redundancy is a common issue faced in DBMS As RDBMS uses keys and indexes, data redundancy does not occur here.
Foreign key and primary key The concepts of foreign key and primary key do not exist in DBMS. Foreign key and primary key are two very important features of RDBMS.
Security of data No data security is available here. Several layers of data security exist in this system
The speed of data fetching DBMS is slower than RDBMS in data fetching RDBMS can fetch data rapidly because of the relationships among the data values

From the above table, we can see that there are lots of advantages in RDBMS compared To DBMS. However, RDBMS is costlier than DBMS. Hence the suitable system is chosen based on the budget and the amount of data.