In simple terms, a digital library is a collection of information that is stored and accessed electronically. Terms such as "electronic library" and "virtual library“ are often used synonymously.
"The generic name for federated structures that provide humans both intellectual and physical access to the huge and growing worldwide networks of information encoded in multimedia digital formats."
Sun Microsystems defines a digital library as the electronic extension of functions users typically perform and the resources they access in a traditional library
The Digital Library Federation (DLF) crafted the following definition: Digital libraries are organizations that provide the resources, including the specialized staff, to select, structure, offer intellectual access to, interpret, distribute, preserve the integrity of, and ensure the persistence over time of collections of digital works so that they are readily and economically available for use by a defined community or set of communities.