Identity providers in Azure AD B2C
Azure AD B2C supports adding additional identity providers. Customers of your application can use these identity providers to sign in to your application. For instance, you can add social media identity providers to your application, and let users sign in with the credentials that belong to the social media account. Azure AD B2C supports several external identity providers, such as Apple, Amazon, Facebook, Google, GitHub, and LinkedIn.
Note
For a detailed overview of all the identity providers that are supported in Azure AD B2C, you can refer to the following article: https://docs.microsoft.com/en-us/azure/active-directory-b2c/add-identity-provider#select-an-identity-provider.
By adding external identity providers, you can give your customers the flexibility to choose how to sign in to your application. They can choose to use their social accounts, or maybe their Microsoft account, without having to create a new account only for your application...