Which feature allows users to highlight critical information in Google Docs?

Highlighting Text is the feature that specifically empowers users to visually emphasize critical information within a Google Docs document. This functionality enables individuals to select portions of text and apply a highlighter effect, making it stand out against other content. This is particularly useful for drawing attention to important details, key concepts, or areas that require further reflection or discussion.

In the context of creating documents, using the highlighting feature enhances readability and allows for a clear focus on significant points. It is a straightforward and effective way to enhance the visual hierarchy of a document, making it easier for readers to engage with the material. The highlighted text serves as a cue, guiding readers to the most essential information at a glance.

The alternative options, while valuable in their own rights, do not fulfill the specific function of highlighting critical information. Commenting allows for discussions or notes but does not change the text's visual emphasis. Formatting tools can alter styles and appearances but may not specifically highlight information in the same way. Spell check is a useful feature for correcting language errors but does not relate to highlighting at all.