Lightweight Directory Access ProtocolLDAP Lightweight Directory Access Protocol (LDAP) is a set of protocols for accessing information directories based on the standards contained within the X.500 standard, but is significantly simpler. (LDAPLDAP Lightweight Directory Access Protocol (LDAP) is a set of protocols for accessing information directories based on the standards contained within the X.500 standard, but is significantly simpler.) is a set of protocols for accessing information directories based on the standards contained within the X.500 standard, but is significantly simpler.