Another Definition
The notion of a "digital library" is a metaphor for
thinking about data collections in a networked
world. Digital libraries may take many forms, but
they all share some common infrastructure and
goals. For starters, digital libraries build upon
collections of digital or digitized data and rely on
the Internet for accessing and sharing these
collections. Common goals include preserving the
data over time for interested communities and
helping transform the data into information and
knowledge.  [NSF 2002 fact sheet]