How is an LDAP(Lightweight Directory Access Protocol) implemented?

How is an LDAP(Lightweight Directory Access Protocol) implemented?
An standard used industry wide for accessing directory services is the LDAP(Lightweight Directory Access Protocol).
1) An LDAP(Lightweight Directory Access Protocol) server is created. It stores and manages server, user, software information.
2) Information stored in LDAP server is used throughout the enterprise or over a network (remote data access)
3) Directory services allow components to lookup information by a distinguished name (DN) from the LDAP server