ASP.NET Core
ASP.NET is a web application framework that developers can use to build dynamic web sites, web applications, and XML web services.
ASP.NET Core is a successor to ASP.NET.
It is a re-implementation of ASP.NET as a modular web framework, which is cross-platform and open-source.
It merges ASP.NET MVC, ASP.NET Web API, and ASP.NET Web Pages into a unified framework.