There are three ways of doing authentication and authorization in ASP.NET:- Windows authentication: - In this methodology ASP.NET web pages will use local windows users and groups to authenticate and authorize resources.
Forms Authentication: - This is a cookie based authentication where username and password are stored on client machines as cookie files or they are sent through URL for every request. Form-based authentication presents the user with an HTML-based Web page that prompts the user for credentials.
Passport authentication :- Passport authentication is based on the passport website provided by the Microsoft .So when user logins with credentials it will be reached to the passport website ( i.e. hotmail,devhood,windows live etc) where authentication will happen. If Authentication is successful it will return a token to your website.
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