DNX or the .NET Execution Runtime is a software development kit and runtime environment that has everything you need to build and run .NET applications for Windows, Mac and Linux. DNX is built for running cross-platform ASP.NET web applications; but it can run other type of applications like console application. When you create an ASP.NET web application using Visual Studio 2015, DNX references will be added by default. This will allow us to develop the web application on Windows and deploy it in Mac system.
DNX not only support the Cross-platform .NET development and deployment, but also support the open source projects. With DNX projects you can easily replace an existing dependency with its source code and let DNX compile it in-memory at runtime.