DBML is a file format used by the Microsoft Visual Studio integrated development environment. This file contains code in Database Markup Language (DMBL), which is the markup language of the database. This language is based on XML. DMBL files are created with the Object Relational (OR) Designer tool that is included with Visual Studio.

With the help of DMBL files, the source code is generated, which optimizes the user's work with database records. Such code is created by the Visual Studio Code Generator program.