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Out of context: Reply #4
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Understanding the two:
The em dash is the mark of punctuation most of us think of when we hear the term "dash" in regard to a sentence. Dashes can be used in pairs like parentheses—that is, to enclose a word, or a phrase, or a clause—or they can be used alone to detach one end of a sentence from the main body. Dashes are particularly useful in a sentence that is long and complex or in one that has a number of commas within it.
The en dash is slightly longer than the hyphen but not as long as the em dash. (It is, in fact, the width of a typesetter's letter "N," whereas the em dash is the width of the letter "M"—thus their names.) The en dash means, quite simply, "through." We use it most commonly to indicate inclusive dates and numbers: July 9–August 17; pp. 37–59.