Information in an LDAP directory is organized into one or more hierarchies where, at the top of the hierarchy, this is a base entry, and other entries are organized in tree-like structures beneath the base entry
Each node on the hierarchy is an entry, with a DN and more than one attributes
The protocol accesses LDAP directories:
A directory is a tree of directory entries.
An entry consists of a set of attributes.
An attribute has a name (an attribute type or attribute description) and one or more values.