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ARIA
Abbreviation for Accessible Rich Internet Applications
In short and in plain language
ARIA is an add-on to the code of web pages. It describes parts you can use, for tools like screen readers.
It tells, for example, what role a part has. It also tells its state and its label. It is used where plain code is not enough.
If it is set wrongly, it can give screen readers a false meaning.
Definition
ARIA is an extension to HTML that describes roles, states and labels of interface elements for assistive technologies such as screen readers. It is used where plain HTML is not enough. If set wrongly, it can convey a false meaning to screen readers.