Apply or remove highlighting - Microsoft Support
Word contains many highlighters to make your text pop off the screen just as if you were highlighting paper with a fluorescent marker. You can select text or an image and then highlight it, or use the Highlight tool to mark different parts of a document.
Applies To:
Word for Microsoft 365, Word for Microsoft 365 for Mac, Word 2021, Word 2021 for Mac, Word 2019, Word 2019 for Mac, Word 2016