Aspnet core
shape
**IActionResult** is an interface in ASP.NET MVC (and also in ASP.NET Core MVC) that represents the result of an action method. In MVC (Model-View-Controller) applications, an action method in a controller returns an instance of IActionResult, which is used to define the response that will be sent back to the client (typically a web browser). Startup class is central to configuring and initializing the application. It provides two key methods, ConfigureServices and Configure, each with distinct roles in setting up the application's services and request processing pipeline.