Visual Studio recently introduced a feature called port tunneling, which creates a new public URL (tunnel URL) for ASP.NET Core projects running on localhost. This allows developers to easily test their web applications on other devices and make them temporarily publicly available for demos and interactive events. Port tunneling is particularly useful for testing webhooks, such as those used by Twilio. By using port tunneling with Visual Studio, developers can create an ASP.NET Core project that handles Twilio SMS webhooks, making it easier to integrate Twilio into their applications. The tutorial covers how to use port tunneling with Twilio, including setting up a Visual Studio project, configuring the tunnel, and handling Twilio SMS webhooks.