Explanation

Automatic text formatting refers to the feature in word processing software that automatically applies formatting to text as you type. 

The examples listed are all common types of automatic text formatting:

• Adjusting extra space: Automatically removing extra spaces between words or sentences.
• Underlining hyperlinks: Automatically underlining links to distinguish them from regular text.
• Replacing two hyphens with an em dash (—): Automatically replacing two hyphens with a single em dash.