Recordable DVDs, or DVD-Rs, are optical discs that allow users to write data once. They are commonly used for storing videos, music, and other digital files. Once data is recorded, it cannot be erased or modified, making them ideal for permanent storage. These discs typically hold about 4.7 GB of data, which is enough for a full-length movie or several hours of video. Recordable DVDs are compatible with most standard DVD players and drives, making them a popular choice for personal and professional use in data archiving and media distribution.