Lists of persons or organizations, systematically arranged, usually in alphabetic or classed order, giving address, affiliations, etc., for individuals, and giving address, officers, functions, and similar data for organizations. (ALA Glossary of Library and Information Science, 1983)

Directory signs or listings of designated areas within or without a facility.

A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.

Sequential operating programs and data which instruct the functioning of a digital computer.

A discipline concerned with studying biological phenomena in terms of the chemical and physical interactions of molecules.