A DVD-RW (Digital Versatile Disc ReWritable) is a type of optical disc that allows users to record, erase, and rewrite data multiple times. It has a storage capacity of about 4.7 GB, making it suitable for storing videos, music, and other files. Unlike a standard DVD-R, which can only be written once, a DVD-RW can be reused, providing flexibility for data management. DVD-RW discs are commonly used for backing up important files, creating home videos, or distributing software. They are compatible with most DVD players and drives, making them a versatile option for data storage and sharing.