Have you worked with NoSQL databases?

Yes, I have worked 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 the form of documents, key-value pairs, graphs, or columns.

For example, MongoDB stores data in JSON-like documents, which is convenient for flexible and rapidly changing data structures. Redis is often used as an in-memory storage for caching and fast data processing.

Using NoSQL databases is justified when high scalability, schema flexibility, or working with unstructured data is required.