The base type for all the RETURN TYPES of action method is “Action Result”. Below are the various return types that can be used to return results from a controller action method. 

1. ViewResult (View): This return type is used to return a webpage from the action method.
2. PartialviewResult (Partial view the ): This is used to send part of a view that is GOING to render inside another view.
3. RedirectResult (Redirect): This is used to redirect to any other controller and action method based on the URL.
4. RedirectToRouteResult (RedirectToAction, RedirectToRoute): This is used  to redirect to any other action method.
5. ContentResult (Content): This is used to return HTTP content type text/plain as the result.
6. JSONResult (JSON): This is used to return JSON as a result.
7. JavascriptResult (javascript): This is used to return the JavaScript CODE that will run in the browser.
8. FileResult (File): This is used to return binary output as a response.
9. EmptyResult: This is used when nothing (VOID) to return.