Are 'www.example.net' and 'forum.example.com/content' two different web sites?

[Conner]

There is a website \[code\]www.example.net\[/code\] and it has a \[code\]Forum\[/code\] link on its home page which leads to \[code\]forum.example.com/content\[/code\].I found out that the main site has been developed using the .NET Framework, and the forum has been built using PHP based \[code\]vBulletin\[/code\].Are these two different domains?In other words, is the \[code\]Forum\[/code\] some folder inside the Visual Studio Project \[code\]www.example.net\[/code\] running as part of the ASP.NET website? Or is \[code\]"forum.example.com/content\[/code\] a link to an altogether different website?