**Service Principal** is an security object that represents registered application in Entra tenant. It defines access policy and permission granted for application in the Entra tenant. It allows app authentication and authorization. ### See also 1. [[Microsoft Entra ID]] 2. [[How to Verify if Service Principal Works?]] ### Reference 1. [Service Principal on Microsoft Learn](https://learn.microsoft.com/en-us/entra/identity-platform/app-objects-and-service-principals?tabs=browser#service-principal-object)