ASP.NET Core is a free and open-source web framework, and higher performance than ASP.NET,[3] developed by Microsoft and the community.It is a modular framework that runs on both the full .NET Framework, on Windows, and the cross-platform .NET Core. However the expected version ASP.NET Core 3 was announced to work only on .NET Core dropping support of .NET Framework

The next version of ASP.NET which is Open source and cross-platform framework. Core apps can run on both on .NET core as well as full .NET framework. Web apps, mobile apps and IoT apps can be created.

ASP .NET Core is a cross platform environment In which we can build our project in windows, Linux and MacOS.