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by hapless 5909 days ago
LDAP was derived from X.500. By comparison, it is lightweight. LDAP contained just the barest minimum structure to express X.500 data. It was originally a protocol meant for clients that were too limited to speak X.500 protocols.

Look at it this way: LDAP is to X.500 as SNTP is to NTP.

SNTP is simple, because NTP is pretty simple. LDAP is a little bit hairy because X.500 was really, really, really hairy.