From Science Europe Data Glossary
Definition: a data library is a collection of data sets for secondary use in research.
Explanation: a data library is normally part of a larger institution (academic, corporate, scientific, medical, governmental, etc.) established to serve the data users of that organization. The data library tends to house local data collections and provides access to them. A data library may also maintain subscriptions to licensed data resources for its users to access. Whether a data library is also considered a data archive may depend on the extent of unique holdings in the collection, whether long-term preservation services are offered, and whether it serves a broader community (as national data archives do).
See also: data repository