"The Lightweight Directory Access Protocol (LDAP) is a network protocol used to access a special purpose database (called a directory) that stores information about people, organizations, and computers. What can LDAP do for your business and your network?
"LDAP was developed as an easier version of the Directory Access Protocol that is part of the X.500 directory standard. It is the network language spoken between a piece of client software (such as an email client) and a directory..."