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MDB is Microsoft Access's original database format, used from Access 97 through Access 2003. It stores tables, queries, forms, reports, macros, and VBA code in a single binary file based on the Jet Database Engine. Millions of small business applications, government databases, and departmental tools were built on MDB files.
The format was replaced by ACCDB in Access 2007, but MDB files persist stubbornly. Legacy applications, regulatory archives, and organisations that never upgraded still run on MDB databases. Some are mission-critical systems maintained by a single person who retired years ago.
Microsoft Access (paid) opens MDB files natively. For free access, MDB Viewer Plus (Windows) reads MDB without Access installed. LibreOffice Base has partial MDB support. For programmatic access, Python's `pyodbc` or `mdbtools` (Linux/Mac) can read MDB tables. If possible, convert to ACCDB or export to SQLite/CSV for long-term preservation.