A CD burner is a device that allows users to write data onto a compact disc, commonly known as a CD. This process is called "burning" because it involves using a laser to etch information onto the disc's surface. CD burners can be found in standalone units or as part of a computer's hardware. These devices can create various types of CDs, including audio CDs for music playback and data CDs for storing files. Many modern computers come equipped with built-in CD burners, while external options are also available for those who need additional functionality or portability.