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There are 3 types of Authentication namely Windows, Forms and Passport Authentication. - Windows authentication - It uses the security features integrated in Windows NT and Windows XP OS to authenticate and authorize Web application users. - Forms authentication - It allows you to create your own list of users and validate their identity when they visit the Web site. - Passport authentication - It uses the Microsoft centralized authentication provider to identify users. Passport allows users to use a single identity across multiple Web applications. Passport SDK needs to be installed to use Passport authentication in your Web application.