All return types are use to return results from controller to view. 

 base type of all  result types is ActionResult. 

ViewResult (View): It is used to return a webpage from an action method.

PartialviewResult (Partialview): It is used to send a part of a view which will be rendered in another view.

RedirectResult (Redirect): It is used to redirect to any other controller and action method depending on the URL.

RedirectToRouteResult (RedirectToAction, RedirectToRoute): It is used when we want to redirect to any other action method.

ContentResult (Content): It is used to return HTTP content type like text/plain as the result of the action.

jsonResult (json): It is used when we want to return a JSON message.

javascriptResult (javascript): It used to return JavaScript code that will run in browser.

FileResult (File): It is used to send binary output in response.

EmptyResult: It is used to return nothing (void) in the result.