A DVD-ROM, or Digital Versatile Disc Read-Only Memory, is a type of optical disc used primarily for storing large amounts of data. Unlike standard CDs, a DVD-ROM can hold significantly more information, typically around 4.7 GB for single-layer discs and up to 8.5 GB for dual-layer discs. This makes it suitable for software distribution, video storage, and other data-intensive applications. DVD-ROMs are designed to be read by DVD drives, which can be found in many computers and standalone players. They are commonly used for distributing movies, video games, and software, providing a reliable medium for accessing content without the risk of accidental modification or deletion.