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The terminology can be a bit confusing. Database Management System is what people often call a database. Unfortunately, the storage engine is also called a database.

Badger, RocksDB, LMDB, etc. are storage engines. A process uses these storage engines to write data to memory (note: the storage engine may support persistent, volatile, or both types of memory).

A database management system (DBMS) is a higher level concept that often has multiple processes either on a single server or distributed across multiple servers. Simply stated, each process within a DBMS uses the storage engine to read/write to/from memory (persistent or volatile).

It's important to note that storage engines are a specialized area and require different skills from writing a DBMS. It's a big deal when other people write high quality storage engines because it makes it a lot easier to write a DBMS.

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