LDAP stands for Lightweight Directory Access Protocol
LDAP is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network
LDAP is mostly used by medium-to-large organizations
The popular example for the reason to use LDAP is “Search for all people located in New York whose name contains “Michel” that have an email address. Please return their full name, email, title, and description.”
LDAP is useful for frequent retrieve and less update scenario.
LDAP contains Authentication and Authorization information and useful to implement Single Sign-On (SSO).