Non-relational databases (NoSQL) typically store semi-structured or unstructured data and have the following characteristics:
* Entities are often self-describing, meaning they store their own schema within the data (e.g., JSON documents).
* Schema is flexible, allowing for changes without restructuring the entire database.
Other options:
* Full support for Transact-SQL # This is a characteristic of relational (SQL) databases, not NoSQL.
* A fixed schema # Also a relational database characteristic.
The answer: self describing entities
Reference: Non-relational data overview