Optical storage refers to the technology that uses light to read and write data on a storage medium, such as CDs, DVDs, and Blu-ray discs. This technology relies on a laser beam that is used to either etch pits onto the surface of the medium (during writing) or read the reflection of the laser from the pits on the surface (during reading). Optical storage technology allows for high-capacity storage of data and is commonly used for distributing software, music, movies, and other forms of multimedia. It is known for its durability and longevity compared to other storage mediums.