An en is a typographic unit, half of the width of an em. By definition, it is equivalent to half of the height of the font (e.g. in 16 point type it is 8 points). As its name suggests, it is also traditionally the width of a lowercase letter "n".
The en dash (–) and en space ( ) are each one en wide. In English, the en dash is used for inclusive ranges (e.g., "pages 12–17" or "August 7, 1988–November 26, 2005"), and increasingly to replace the long dash. (Note than when using it to replace a long dash, spaces are needed either side of it – like so.)
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