A DVD-R is a type of digital versatile disc that is used for storing data, video, and audio. It is a recordable format, meaning users can write data onto the disc only once. Once the data is burned onto a DVD-R, it cannot be erased or modified, making it suitable for permanent storage. DVD-R discs typically hold up to 4.7 gigabytes of data, which is enough for a full-length movie or several hours of video. They are compatible with most DVD players and drives, making them a popular choice for personal and professional use in distributing content.