The Lightweight Directory Access Protocol, LDAP for short, is a 'fork' of the original X.500 specification for Directory Access Protocol. This X.500 was large and heavy. It also required an OSI protocol stack to run. LDAP was made to be leaner and able to run on top of TCP/IP instead of the OSI complete stack. Active Directory, the directory software that many Windows based enterprise networks use, is LDAP at its heart. Directory services can provide many benefits to a home network or a business. With LDAP setup, it is relatively easy to setup a single sign-on on every computer or have a global address book. The first step is the installation which is very easy on Ubuntu.