XML, an acronym for Extensible Markup Language, refers to a file that is used by various applications to store data. An XML file can be opened by a variety of applications, including most Internet browsers, but only a handful of programs, such as Notepad++ and Adobe Dreamweaver, can edit it.
XML files are text-based in design and can be displayed on basic text editor programs. XML files can be used to store various forms of data, such as sheet music. MusicXML files can be opened and read on a variety of software, but they are mainly used to store data on sheet music programs, such as Finale NotePad.