ASP.NET Core is a complete redesign of the previous web framework from Microsoft, called ASP.NET. It is built to run on multiple platforms — Windows, Mac, and Linux — and is lightweight, modular, and supports modern web application development.

It has multiple advantages over ASP.NET, especially when it comes to the development of SPAs:

• Can run on any platform thanks to its foundation of .NET Core
• Completely open source
• Designed to be lightweight and fast
• Built to be modular from the very beginning
• Can run from IIS, self-hosted, or any other web server