En dash

En dashes – twice the length of a hyphen – are used for ranges, for example number ranges (66–67); communicating relationships (work–life balance); or for enclosing or introducing parenthetical text (an aside or extra to the main text – like ‘twice the length of a hyphen’, above). In US and Oxford style an unspaced em dash—like this—usually does the job of enclosing or introducing parenthetical text.

As an editor your job will often be to change spaced hyphens in running text - like this - to spaced en dashes – like this – or unspaced em dashes—like this—depending on style.