Databases are indexes, i.e. they do not usually lead you directly to the actual text of the resource you are after but help you identify references. A Subject Gateway is an internet site set up to provide easy links to useful subject-based information. The resources will have been reviewed by a specialist before they are added to the site. A Library in the context of the Digital Library is a library Catalogue, which allows you to search the collections of a number of national and academic libraries.