Have you worked with NoSQL databases?

Yes, I have experience working with NoSQL databases such as MongoDB and Redis. NoSQL databases differ from relational ones in that they do not use fixed schema tables, but store data in more flexible formats — for example, documents (JSON-like structures), key-value, graphs, or column stores. This allows efficient handling of large volumes of unstructured or semi-structured data, as well as providing high scalability and performance in distributed systems. For example, MongoDB is well-suited for applications with dynamic data schemas, and Redis is often used for caching and fast in-memory data processing.