What is drag and drop file?
HTML Drag and Drop interfaces enable web applications to drag and drop files on a web page. This document describes how an application can accept one or more files that are dragged from the underlying platform's file manager and dropped on a web page.
What is a drop file?
dropfile (plural dropfiles) (computing, dated) A file used by a bulletin board system (BBS) to pass information about the BBS itself and the current user to an external door.