LDAP (or Lightweight Directory Access Protocol) is an Internet protocol that allows a server administrator to publish user information (called "attributes") on an LDAP server. When LDAP is enabled by your administrator, other Internet users with LDAP-enabled client programs can access your information.
The LDAP attributes that the LDAP server can publish are shown on this page. They include First Name, Last Name, Organization, Organization Unit, Street Address, City, State, Country, Postal Code (Zip), Telephone, State, Country, and Reply To Address.
If you want to hide your user information from other Internet users, in the Account Options... menu, select Change My User Info, check the box labeled Hide From Info Services and click the Save button.