What is ASP.NET Core?

If you use ASP.NET, you'll soon come across the term ASP.NET Core. ASP.NET Core is the open-source and cross-platform version of ASP.NET. You should use ASP.NET Core for all new applications. The tutorials on this site all use ASP.NET Core. The Windows-only versions of ASP.NET, that existed before ASP.NET Core, is typically just referred to as ASP.NET. The majority of innovation occurs in ASP.NET Core, but other versions continue to receive minor updates and bug-fixes.