What the aria-busy and aria-tomic used for?

Question

I could not find in which cases Aria-atomic and aria-busy attributes

Answer 1

A two second search on Google would have brought the following:

aria-atomic: The aria-atomic=BOOLEAN is used to set whether or not the screen reader should always present the live region as a whole, even if only part of the region changes. The possible settings are: false or true. The default setting is false.

Source: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions

aria-busy="true" is set when a relevant portion of the page is currently getting updated and the users are waiting to read the updated content. Users of assistive technology will not be able to read anything while the content is getting updated. They could probably hear "busy" with some screen readers. Once the content is updated, content authors can set aria-busy="false" or remove the aria-busy attribute Once the content is updated, the assistive technologies gather the updated information and provide it to the user.

Source: https://accessibilityresources.org/aria-busy

Answer 2

Aria, is a set of attributes that are added to HTML in order to make web apps more accessible to users with disabilities.

Aria-atomic, Aria-busy, and more, are just some attributes specific to live regions on the webpage.

check this for more info.