You can insert a line in a Word document by typing three characters that autocorrect into a line. Characters like underscores, equal signs, and pound signs autocorrect into different kinds of lines.

Learn how to insert a Horizontal Line in Outlook across the entire page cell or column. It is used as a separator for long email messages.

Typing over a line, but the text is not staying on the line? Learn how to add text over a line without the line moving in Microsoft Word.