Why ASP.Net Core Web APIs?
ASP.NET Core is OS neutral and integrates seamlessly with popular client-side frameworks and libraries, including Blazor, Angular, React, and Bootstrap. Millions of developers have used (and continue to use) ASP.NET 4.x to create web apps. ASP.NET Core is a redesign of ASP.NET 4.x, with architectural changes that result in a leaner, more modular framework.
ASP.NET Core Web API is a framework that makes it easy to build HTTP services that reach a broad range of clients, including browsers and mobile devices. ASP.NET Core Web API is an ideal platform for building RESTful applications.
HTTP is not just for serving up web pages. It is also a powerful platform for building APIs that expose services and data. HTTP is simple, flexible, and ubiquitous. Almost any platform that you can think of has an HTTP library, so HTTP services can reach a broad range of clients, including browsers, mobile devices, and traditional desktop applications.