REST in ASP.NET Core

When you browse to a webpage, the web server communicates with your browser by using HTML, CSS, and JavaScript. If you interact with the page by doing something like submitting a sign-in form or selecting a buy button, the browser sends the information back to the web server.

In a similar way, web servers can communicate with a broad range of clients (browsers, mobile devices, other web servers, and more) by using web services. API clients communicate with the server over HTTP, and the two exchange information by using a data format such as JSON or XML. APIs are often used in single-page applications (SPAs) that perform most of the user interface logic in a web browser. Communication with the web server primarily happens through web APIs.