What is the difference between Ajax.BeginForm and Html.BeginForm in Asp.net MVC

Basically, one builds one form using Ajax, and the other builds a simple form, both in HTML.

In Ajax forms, the request is sent by JavaScript and there is usually no transition from the current page: only updating the elements displayed with adding, modifying or deleting them. The transition can be made a posteriori using additional JavaScript code, if applicable.

Simple forms assume a page transition and usually work with only two verbs: POST (whose form values are not included in the URL) and GET (whose values are in the URL).