In what situations is it preferable to use solutions based on NoSQL databases?

NoSQL databases are preferred in the following situations:

• Flexible data structure: when data does not fit into a rigid relational table schema, for example, documents with different structures.
• Large volumes of data and high write speed: NoSQL often scales horizontally and handles load better.
• High availability and fault tolerance are required: many NoSQL systems are designed with distribution and replication in mind.
• Working with unstructured or semi-structured data: for example, JSON, graphs, key-value.
• Rapid development and schema changes: no need for migrations when changing data structure.

Example: if you need to store user data with different information (for example, different profile fields), a document database (MongoDB) would be more convenient than a relational one.