What is ASP.NET Core:-
ASP.NET Core is an open source and cloud-optimized web framework for developing modern web applications that can be developed and run on Windows, Linux and the Mac. It includes the MVC framework, which now combines the features of MVC and Web API into a single web programming framework.
ASP.NET Core apps can run on .NET Core or on the full .NET Framework.
It was architected to provide an optimized development framework for apps that are deployed to the cloud or run on-premises.
It consists of modular components with minimal overhead, so you retain flexibility while constructing your solutions.
You can develop and run your ASP.NET Core apps cross-platform on Windows, Mac and Linux.