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ACCDB is Access's modern database format, introduced with Access 2007. It uses the ACE (Access Connectivity Engine) instead of the older Jet engine, supporting better encryption, attachment data types, multivalued fields, and integration with SharePoint. The 2 GB size limit remains, but the security and feature improvements are significant.
Like its predecessor, ACCDB stores everything in one file: tables, queries, forms, reports, macros, and VBA modules. It's the small business database — a step up from spreadsheets, a step below SQL Server. For departmental applications, data entry tools, and report generators, Access remains surprisingly relevant despite decades of predictions about its demise.
Microsoft Access (part of Microsoft 365 or standalone) is the primary tool. Free alternatives are limited: LibreOffice Base has some compatibility but doesn't handle forms or reports. For read-only access, UCanAccess (Java library) or Python's `pyodbc` with the ACE OLEDB provider work on Windows. Cross-platform access to ACCDB is genuinely difficult.