The primary use of LDAP search is to provide space in a central place of the authentication database for storing username, passwords, and data. 

It can be used in different applications and services of the end-user system.

Also, it can be used to add different operations in an active directory server database to authenticate and manage system activities like:- 

1) Bind session

2) Delete unnecessary LDAP entries

3) Entries used in different commands

4) Modify data in directories.