Security Principal

A security principal can be either a (In the Windows World):

• User
• Group
• Service
• Computer

In the Azure AD, it refers to either a:

• User
• Group
• Application

which has granted access

Sources:

• https://www.sqa.org.uk/e-learning/NetServerOS02CD/page_08.htm
• https://docs.microsoft.com/en-us/windows/security/identity-protection/access-control/security-principals
• https://docs.microsoft.com/en-us/learn/modules/secure-azure-resources-with-rbac/2-rbac-overview