What feature can be used to highlight important information in a Word document?

The feature that best highlights important information in a Word document is highlighting text. Highlighting text uses a background color to draw attention to specific parts of the document, making the highlighted information stand out prominently against the rest of the text. This function is designed specifically for the purpose of emphasis and visibility, making it an effective tool for marking key points, important data, or notable quotes within a larger body of text.

While adjusting font size, changing font style, and using colored text can also enhance the appearance of a document or draw attention to certain elements, they do not provide the same level of immediacy and emphasis as highlighting. Highlighting visually separates the selected text from the surrounding content, thus ensuring that it captures the reader's eye quickly and effectively.