What is the definition of underline in ms word?

In Microsoft Word, "underline" refers to a text formatting feature that adds a horizontal line beneath selected text. It is commonly used to emphasize or highlight specific Words or phrases. Users can apply underlining using the toolbar icon or by pressing "Ctrl + U" on their keyboard. Additionally, Word offers various underline styles, such as single, double, or dotted lines, which can be customized through the font formatting options.