Digital Library

A digital library is a collection that has been organised, described and made searchable, not simply a pile of files on a server. That distinction is the subject of this section: the work of scanning, describing, storing and serving material so that a reader can find one page among millions.

Digitization is the visible half. A book is photographed, the images are processed, text recognition turns pictures of letters into searchable words. The invisible half is metadata: the author, the edition, the language, the rights, the dates, the identifiers that let one record be matched against another. Without it a scanned book is unfindable, which is the same as being lost.

Then there is keeping it. Paper survives neglect for centuries; a file survives nothing without maintenance, because formats fall out of use, storage fails and links break. Preservation is an ongoing act rather than a finished one.

Begin with What Is a Digital Library? for the overview. How Libraries Work explains catalogues and classification, which digital collections inherit rather than replace. Future of Knowledge follows the harder questions about search, machine reading and what happens to material nobody chose to copy.