LDAP (Lightweight Directory Access Protocol) is the standard protocol for querying and updating a company's directory of users, computers and groups, such as Active Directory. Kerberos is the protocol that verifies user identity with encrypted tickets so passwords do not travel across the network. Together they underpin sign-in and authentication in Windows (Active Directory) domains.
Related term in this glossary: Domain controller
LDAP, Kerberos, Active Directory, directory protocol, LDAPS