drag and drop is a pointing device gesture in which the user
selects a virtual object by "grabbing" it and dragging it to a
different location or onto another virtual object. In general, it
can be used to invoke many kinds of actions, or create various
types of associations between two abstract objects.
A breadcrumb or breadcrumb trail is a graphical control element
frequently used as a navigational aid in user interfaces and on web
pages. It allows users to keep track and maintain awareness of
their locations within programs, documents, or websites
