Final answer:
The attribute aria-labelledby is used to associate an element with a label or title, while aria-describedby is used to associate it with additional descriptive information.
Step-by-step explanation:
The attribute aria-labelledby is used to associate an element with another element that acts as a label or title for it. The aria-labelledby attribute takes the ID of the labeling element as its value. This is useful when providing a readable label for an element that is not directly associated with a visible label.
The attribute aria-describedby is used to associate an element with another element that contains additional descriptive information about it. The aria-describedby attribute takes the ID of the element with the descriptive information as its value. This is helpful for providing further clarification or context for an element.
For example, consider a form with an input field labeled 'Email:' and an error message displayed below it. In this case, you would use aria-labelledby to associate the input field with the label element, and aria-describedby to associate the input field with the error message element.