Em dash

Em dashes are used to set parenthetical expressions apart from the sentence (similar to commas and parentheses). Using an em dash provides more emphasis than a comma, but less than parentheses.

For example: Em dashes allow for an additional thought to be added by creating a break in a sentence—as I’ve done here.

Note: Em dashes should be written with no spaces separating the em dash from the words on either side.