The .vbhtml file extension is used for web pages written using the Razor syntax with Visual Basic .NET. Razor is a markup syntax that allows you to embed server-based code (in this case, VB.NET) into web pages. These files are typically used in ASP.NET MVC or ASP.NET Core applications to create dynamic web content. When a user requests a .vbhtml page, the server processes the VB.NET code within the file, generating HTML output that is then sent to the user's browser. This allows for dynamic content generation, data binding, and server-side logic to be integrated directly into the web page's markup. The Razor engine handles the parsing and execution of the VB.NET code, making it a powerful tool for building interactive and data-driven web applications. VBHTML files are compiled on the server before being sent to the client, which improves performance and security. They are a key component in building modern, scalable web applications using the Microsoft technology stack. The files contain a mix of HTML markup and VB.NET code, allowing developers to create dynamic web pages with ease.