# Windows - Glossary of Terms

AAD = Azure Active Directory (now Microsoft Entra ID)

ADCS = Active Directory Certificate Services

ADDS = Active Directory Domain Services

AIA = Authority Information Access

CA = Certificate Authority

CDP = CRL Distribution Point

CRL = Certificate Revocation List

CSR = Certificate Signing Request

Ed25519 = Edwards-curve Digital Signature Algorithm

GPO = Group Policy Object

IP = Internet Protocol

LDAP = Lightweight Directory Access Protocol

MMC = Microsoft Management Console

OCSP = Online Certificate Status Protocol

PKI = Public Key Infrastructure

RSA = (Rivest-Shamir-Adleman)

SHA = Secure Hash Algorithm

SPN = Service Principal Name

TCP = Transmission Control Protocol

UPN = User Principal Name

*Last verified: October 2026*

Sources:

- [https://learn.microsoft.com/en-us/entra/fundamentals/new-name](https://learn.microsoft.com/en-us/entra/fundamentals/new-name)