The IActionResult type is a based abstraction of an ActionResult.
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💡 An ActionResult is a return type of a controller method, also called an action method, and serves as the base class for *Result classes. Action methods return models to views, file streams, redirect to other controllers, or whatever is necessary for the task at hand.

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It specifies how a response is going to be given for a Specific Request.
The IActionResult return type is appropriate when multiple action result return types are possible in an action.
<img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1655564546892/ZN4HUeF28.png" alt="IActionResult Overview Diagram" />
The IActionResult is an interface, while action results themselves are abstract classes.
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The IActionResult type is a based abstraction of an ActionResult.

<aside>
💡 An ActionResult is a return type of a controller method, also called an action method, and serves as the base class for *Result classes. Action methods return models to views, file streams, redirect to other controllers, or whatever is necessary for the task at hand.

</aside>

It specifies how a response is going to be given for a Specific Request.

The IActionResult return type is appropriate when multiple action result return types are possible in an action.

![IActionResult Overview Diagram](https://cdn.hashnode.com/res/hashnode/image/upload/v1655564546892/ZN4HUeF28.png)

The IActionResult is an interface, while action results themselves are abstract classes.

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An ActionResult is a return type of a controller method, also called an action method, and serves as the base class for *Result classes.

Nawodya Ishan's blog

Nawodya Ishan's blog

ASP.NET Core MVC - What is IActionResult?