There are many different types of DBMSs in SQL, but some of the most popular ones include:

• Relational database management system (RDBMS): This is the most common type of DBMS and is used to store data in tables. Tables are made up of rows and columns, and each row represents a record and each column represents a field. RDBMSs are known for their ACID properties, which guarantee that data is always consistent, accurate, and reliable. Some popular RDBMSs include MySQL, PostgreSQL, and Oracle.
• Object-relational database management system (ORDBMS): This type of DBMS combines the features of RDBMSs with object-oriented programming. ORDBMSs allow you to store data in objects, which are more flexible than tables. Some popular ORDBMSs include IBM DB2, Microsoft SQL Server, and Oracle.
• NoSQL database: This type of DBMS is designed to store and manage large amounts of unstructured data. NoSQL databases do not use the traditional relational model and can be used for applications that require high scalability and performance. Some popular NoSQL databases include MongoDB, Cassandra, and DynamoDB.
• Document-oriented database: This type of NoSQL database stores data in documents. Documents are like JSON objects and can store any type of data. Document-oriented databases are a good choice for applications that need to store and manage large amounts of semi-structured data. Some popular document-oriented databases include MongoDB and Couchbase.
• Key-value store: This type of NoSQL database stores data in key-value pairs. Keys are unique identifiers and values can be any type of data. Key-value stores are a good choice for applications that need to store and manage large amounts of frequently accessed data. Some popular key-value stores include Redis and Memcached.

The best type of DBMS for you will depend on your specific needs and requirements. If you are not sure which type of DBMS to use, I recommend that you consult with a database expert.