What is ViewData, ViewBag, and TempData?

• ViewData – A Dictionary<string, object> for passing data from controller to view in the same request.
• ViewBag – A dynamic wrapper around ViewData for more convenient syntax.
• TempData – Persists data across one redirect; cleared after it is read.

ViewData/ViewBag are for same-request communication; TempData is designed for redirect scenarios such as Post-Redirect-Get.