Difference between Windows and Forms authentication in ASP.Net

Windows authentication will ask for Windows Username and Password in order to access the website or its page.

On the other hand Forms Authentication can be implented using database or XML file or similar storage.

The Username and Password are validated from Database and does not require the user to be a Windows user.

Refer these links

http://www.codeproject.com/Articles/98950/ASP-NET-authentication-and-authorization

http://www.codeproject.com/Articles/14350/Basic-authentication-in-ASP-NET-against-custom-dat

http://www.codeproject.com/Articles/94612/Windows-Authentication