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Optical storage devices use lasers to read and write data on reflective surfaces. The three examples that fit this definition are Blu-ray Discs (BD), Digital Versatile Discs (DVD), and Compact Discs (CD). All three formats store data in a way that requires a laser to read the information encoded on the disc's surface.

Blu-ray Discs are known for their high capacity and ability to store high-definition video and large amounts of data. DVDs are commonly used for standard-definition video and data storage, while CDs have a smaller capacity and are often used for audio files and smaller data sets.

In contrast, the other options include devices like USB drives, hard disk drives (HDDs), and cloud storage, which do not utilize optical technology. USB drives and HDDs use electronic and magnetic methods for data storage, while cloud storage relies on internet-based servers rather than physical optical discs. Thus, the selection of Blu-ray, DVD, and CD correctly identifies three examples of optical storage devices.