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ARIA
Abbreviation for Accessible Rich Internet Applications
In short and in plain language
ARIA is a technique for people who build websites.
They use it to add details to controls in the code. These are roles and states.
Screen readers then know more. They see if a part is open or if something is a menu.
Used the wrong way, it can make a page harder to use. So clean code comes first.
Definition
ARIA is a W3C technique that lets developers add roles, states and properties to interface elements in the code. Screen readers use this to recognise, for example, whether a section is expanded or an element is a menu. Used incorrectly, ARIA can make operation harder, so clean HTML comes first.