Understanding App Registration vs. Enterprise Application in Microsoft Entra ID

 In Microsoft Entra ID (formerly Azure Active Directory (AAD)), both App registration and Enterprise application registration are essential components for configuring applications that interact with Azure services or other applications. They serve distinct purposes within the application setup process.

App registration:

  • Creates a globally unique application object, also known as an app registration.
  • This object defines the core details of your application, such as its name and what it does.
  • It also generates an application (client) ID used for identification.
  • Think of it as the blueprint for your application.
  • You perform app registration in the Azure portal under "App registrations".

Enterprise application registration (Service principal):

  • Represents a specific instance of an application (created via app registration) within a particular Microsoft Entra ID (formerly Azure Active Directory (AAD)) tenant (your organization's tenant).
  • This creates a service principal object, which facilitates authentication and authorization for the application within that tenant.
  • So, if your app is used by multiple organizations (tenants), each tenant will have its own service principal object linked to the original application object.
  • Consider the service principal the local representative of your application in each tenant.
  • Enterprise applications are managed in the Azure portal under "Enterprise applications".

Here's an analogy to illustrate the distinction between App registration and Enterprise application registration in Microsoft Entra ID (formerly Azure Active Directory (AAD)) :

  • Imagine your app as a car design. App registration is like finalizing the blueprint - the design details, engine type, etc.
  • The Enterprise application is like a specific car manufactured from that blueprint. Each tenant (organization) can have their own car (service principal) based on the same blueprint (app registration).

Essentially, you create an app registration (blueprint) first. This process automatically creates a service principal (local car) in your home tenant. When another tenant wants to use your app, they grant permissions to the app registration (blueprint), and a corresponding service principal (car) is created within their tenant.

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