Can you list different types of database management systems you know?

Database management systems (DBMS) can be classified by various criteria. Here are the main types:

• Relational DBMS (RDBMS): data is stored in tables with clearly defined relationships. Examples: MySQL, PostgreSQL, Oracle.
• Document-oriented DBMS: store data in document formats (usually JSON-like). Examples: MongoDB, CouchDB.
• Key-value stores: simple structure where data is stored as key-value pairs. Examples: Redis, Riak.
• Column-oriented DBMS: optimized for analytics and storing large volumes of data by columns. Examples: Apache Cassandra, HBase.
• Graph DBMS: store data as graphs, suitable for complex relationships. Examples: Neo4j, JanusGraph.
• Object-oriented DBMS: store data as objects, similar to OOP.

Each type is suitable for different tasks and use cases.