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Lightweight Directory Access Protocol is used to access the directory services from the Active directory in Windows operation systems.

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Posted by vishwesh

LDAP is also used in GSM.

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Posted by waqqas1

Short for Lightweight Directory Access Protocol, a set of protocols for accessing information directories. LDAP is based on the standards contained within the X.500 standard, but is significantly simpler. And unlike X.500, LDAP supports TCP/IP, which is necessary for any type of Internet access. Because it's a simpler version of X.500, LDAP is sometimes called X.500-lite.
From Webopedia.com

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Posted by sagitraz