ARIA (Accessible Rich Internet Applications) defines a way to make Web content and Web applications more accessible to people with disabilities.
The hidden attribute is new in HTML5 and tells browsers not to display the element. The aria-hidden property tells screen-readers if they should ignore the element. Have a look at the w3 docs for more details:
https://www.w3.org/WAI/PF/aria/states_and_properties#aria-hidden
Using these standards can make it easier for disabled people to use the web.
A hidden attribute is a boolean attribute (True/False). When this attribute is used on an element, it removes all relevance to that element. When a user views the html page, elements with the hidden attribute should not be visible.
Example:
You can’t see this
Aria-hidden attributes indicate that the element and ALL of its descendants are still visible in the browser, but will be invisible to accessibility tools, such as screen readers.
Example:
Take a look at this. It should answer all your questions.
Note: ARIA stands for Accessible Rich Internet Applications
Sources: Paciello Group