Can you name different types of database management systems?

Database management systems (DBMS) can be classified by various criteria. 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 the form of documents (usually JSON or BSON). Example: MongoDB.
• Key-Value DBMS: simple structure where data is stored as key-value pairs. Example: Redis.
• Columnar DBMS: optimized for storing and processing large volumes of data by columns. Example: Apache Cassandra.
• Graph DBMS: store data as nodes and edges of a graph, suitable for complex relationships. Example: Neo4j.

Each type is suitable for different tasks and use cases.