For the technical purpose of database developers and administrators, a database is simply a collection of operating system files.
Database files are normally stored in a proprietary binary format that can only be mounted by an instance of the relational database software that created them.
The purpose of the database instance is to manage and deliver the data held within the database files for the users.
Modern Relational Database Management Systems (RDBMS) provide a declarative natural language abstraction layer called SQL to query the data held within the database, and provides ACID (atomicity, consistency, isolation, durability) based transactions as a key feature and benefit over other alternatives for data storage.
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