What's the important of drag and drop on a website

Question

please can someone help me with the important of drag and drop feature on a website. I need an example of a work on a website that needs drag and drop. I am really confused here. please I need help

Answer 1

For instance, a site which enables you to draw tables / UML diagrams online and save it to your local device. You will have to provide drag-and-drop features for objects and relations.

Answer 2

sometimes it might be convenient to drag and drop =>link or src addresses

Answer 3

For example as @Hatsy stated:
http://www.umlet.com/umletino/umletino.html

Answer 4

It is also great for matching quizzes. Users drag the term and drop it next to its explanation.