Final answer:
White space in data visualization is the empty area without content that helps prevent a cluttered look and aids in emphasizing key data.
Step-by-step explanation:
The term white space in data visualization refers to the unmarked portions of a page or a screen, which are devoid of any visual or textual content. White space plays a critical role in the design and overall effectiveness of a graphic by creating a visual buffer that allows the data to stand out and enables the user to focus on the essential elements of the visualization. Effectively employing white space can help to avoid a cluttered appearance and emphasize the most important parts of the data being presented.