Highlighted vs Underscore - What's the difference?

As verbs the difference between highlighted and underscore

is that highlighted is while underscore is to underline; to mark a line beneath text.

an underline; a line drawn or printed beneath text; the character.

* hilited (informal)

(head)

(en noun)

An underline; a line drawn or printed beneath text; the character .

(music) A piece of background music.

(underscor)

To underline; to mark a line beneath text.

To emphasize or draw attention to.

I wish to underscore the importance of proper formatting.