How do you type m dash?

Windows
  1. For an em-dash, hold down the Alt key and type 0151, then release the Alt key. That’s it!
  2. For an en-dash, hold down the Alt key and type 0150, then release the Alt key. Pretty simple, right?

Where do you use an M dash?

An em dash is often used in place of a colon or semicolon to link clauses, especially when the clause that follows the dash explains, summarizes, or expands upon the preceding clause in a somewhat dramatic way.