LDAP stands for Lightweight Directory Access Protocol. As the name suggests, it is a lightweight protocol for accessing directory services, specifically X.500-based directory services. LDAP runs over TCP/IP or other connection oriented transfer services. LDAP is an IETF Standard Track protocol and is specified in “Lightweight Directory Access Protocol (LDAP) Technical Specification Road Map” RFC4510.
For more documentation on OpenLDAP itself, see here.
This charm provides an OpenLDAP server using the SQL backend.
For details on configuration options see this page.