|
The word directory is used in computing and telephony meaning a repository or database of information. A directory, as opposed to a conventional database, is heavily optimized for reading, with the assumption that data updates are very rare compared to data reads. Commonly, a directory supports search and browsing in addition to simple lookups. A website which offer access to a categorized listing of other websites optimized for lookup, search, or browsing is a directory, a web directory. The Open Directory Project is an example of a web directory. Directory technology is often used in white page applications and network information services. WHOIS is a prominent example of directory service providing white pages. The Domain Name System (DNS) is a prominent example of directory service providing a network information service. DNS is also an example of a distributed hierarchical directory service that only has simple lookup capabilities. The X.500 and LDAP directory services are examples of general-purpose distributed hierarchical object-oriented directory technologies. Both offer complex searching and browsing capabilities are used for white pages, network information services, public key infrastructure, and a wide range of other applications.
See also | ||||||||
|
| |||||||||
 |
|
| |