MongoDB

MongoDB is a document database that stores each record as a BSON document, so a row and its related fields live together and the schema can change without a migration for every column. Indexes cover the fields you query on, aggregation pipelines reshape data server-side, transactions guard multi-document writes, and sharding spreads collections across replica sets.

Teams reach for it when the shape of the data is varied or nested, for example catalogues, event documents, user profiles, and content backends.

Hosting the replica set on your own infrastructure keeps those documents on hardware you administer, with no seat licensing and a direct path to snapshots and point-in-time restore.