W3c accessibility dialog

1. What is role dialog in HTML?
2. What is the difference between dialog and modal?

What is role dialog in HTML?

The dialog role is used to mark up an HTML based application dialog or window that separates content or UI from the rest of the web application or page. Dialogs are generally placed on top of the rest of the page content using an overlay.

What is the difference between dialog and modal?

Dialog (dialogue): A conversation between two people. In a user interface, a dialog is a “conversation” between the system and the user. Mode: A special state of the system in which the same system has somewhat different user interfaces.