ASP .NET Core - Next generation of ASP. NET
ASP.NET Core is a free and open-source web framework developed by Microsoft and the community. It is the next generation of ASP .NET platform.
Unlike, its predecessor which often comes packed with many packages/libraries (sometime unwanted or a Overkill). This new framework follows a modular approach like nodejs. It that runs on both the full .NET Framework, on Windows, and the cross-platform .NET Core.
The framework is a complete rewrite that unites the previously separate ASP.NET MVC and Web API into a single programming model.