A CD Writer is a device that allows users to create and record data onto compact discs, commonly known as CDs. It can be used to store music, videos, documents, and other types of files. CD writers can be found in computers or as standalone devices, and they typically use laser technology to etch data onto the disc's surface. To use a CD writer, a blank CD is inserted, and the desired files are selected for burning. The process of writing data onto the CD is called "burning," and once completed, the CD can be played in compatible devices like CD players and DVD players.