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Lightweight Directory Access Protocol (LDAP) is an open protocol for sharing directory information and can be used as an alternative to CAS to allow users to log in to a web application using their GT Account Username and password. Unless your application doesn't support CAS, it's best to use it instead of LDAP, since LDAP requires obtaining a special GTED LDAP user account for your application.
If you just want basic directory information for users without the ability to do user authentication, there is a public GT LDAP server called 'Whitepages' that can be queried from any server or workstation on-campus.