This article is a companion to About Azure Active Directory B2C and provides a more in-depth introduction to the service. We will discuss here the primary resources you work with in the service, its features and learn how they enable you to provide a fully custom identity experience for customers in your applications., An access token contains claims that you can use in Azure Active Directory B2C (Azure AD B2C) to identify the granted permissions to your APIs. To call a resource server, the HTTP request must include an access token. An access token is denoted as access_token in the responses from Azure AD B2C. This article shows you how to request an access token for a web application and web API. For more , Before your applications can interact with Azure Active Directory B2C (Azure AD B2C), they must be registered in a tenant that you manage. This tutorial shows you how to register a web application using the Azure portal. A "web application" refers to a traditional web application that performs most of the application logic on the server., Learn how to customize the user interface with HTML templates for your applications that use Azure Active Directory B2C., Azure Active Directory B2C offers two methods to define how users interact with your applications: through predefined user flows or through fully configurable custom policies. The steps required in this article are different for each method., Learn about approaches to solving errors when working with custom policies in Azure Active Directory B2C..