This document provides an overview of LDAP (Lightweight Directory Access Protocol) including: 1) An introduction to LDAP describing its structure and components like entries, attributes, object classes, and distinguished names. 2) Instructions on installing and configuring OpenLDAP on a system including selecting the base DN, admin user, and database backend. 3) Examples of LDAP entries for users and groups and utilities for managing LDAP like ldapsearch, ldapadd, and ldapmodify.