Microsoft Access A software program (application) used to create databases.   Microsoft Access is a relational database management system (RDMS) from Microsoft.   RDMSs (such as access) allow for linking tables that have similar fields.   MS Access combines the Jet relational database engine with a graphical interface intended to make it possible for relatively unskilled programmers and non-programmer "power users" to build front ends to databases. For skilled developers and data architects, it can allow for the rapid development of applications.   MS Access runs under Microsoft Windows.   Most often Access databases are used for mailing lists, phone lists and as address books.