Can you name some non-relational database management systems you are familiar with?

Some popular NoSQL database management systems include:

• MongoDB — a document-oriented database.
• Redis — a key-value store, often used for caching.
• Cassandra — a distributed columnar database, well-suited for large volumes of data.
• CouchDB — a document-oriented database with replication support.
• Neo4j — a graph database for storing and analyzing relationships.

Each of these systems is optimized for different tasks and data models, differing from traditional relational databases.