Use an em dash (—) to set off a break in thought
Use an em dash to add emphasis
Use an em dash to replace commas, parentheses, or colons in some cases
On Windows, press Alt+0151
On Mac, press Shift+Option+Hyphen
On iPhone or iPad, press and hold the hyphen key and select the em dash
On Android, press and hold the hyphen key or use the symbol keyboard
In Microsoft Word, type two hyphens and press Space or use Insert > Symbol
In Google Docs, type two hyphens and let auto-replace convert them
In HTML, use — or —