ACCDB, Access 2007 Database File (.accdb)
The ACCDB Database file format
Databases that have been created with the database program Microsoft Access save their files with an ACCDB file extension. These database files contain data that is organized in certain fields and tables. Previous to ACCDB files, Microsoft Access used the MDB file extension for storing databases. ACCDB extended the functionalities of these files. ACCDB files were first used by Microsoft Access 2007, but is compatible with later versions as well.
Technical details of ACCDB files
The data stored in ACCDB files may contain custom forms as well as SQL queries and other kind of data. They are typically organized in field and tables. New functions of the ACCDB file compared to its predecessors include the storage of file attachments, support for several values in one field, encryption and a way better integration in other Microsoft products like Outlook and SharePoint.