How does the Open Publication Distribution System help readers find e-books?

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A person holds a Sony e-reader displaying text in front of a large illuminated sign reading e-book multiple times at the Frankfurt Book Fair in Germany. — e-book An e-reader on display at the Frankfurt Book Fair, Germany, 2012.

The Open Publication Distribution System (OPDS) helps readers find e-books by providing a framework for open distribution systems where e-book metadata is freely available and can be shared across different platforms.1

Unlike closed, proprietary systems that restrict access to specific software or retailers, OPDS catalogs can be incorporated directly into various e-reading applications. Because this metadata is open, it allows e-book files to be discovered and accessed by users through a wider range of services, rather than being locked into a single company's ecosystem. By making these catalogs freely shareable, OPDS facilitates a more accessible environment for readers to locate and download e-books.1