This may sound stupid but what is that dash thingy that people use in books?

i'm writing a book on msword. and i need a long - ( long hyphen) well it looks like - (the key on the keyboard between the zero 0 and +) but in books the dash is longer.. . if i press it twice it make two dashes and no one long one. -- how do i get this? is it a keyboard shortcut of something i have to... show more i'm writing a book on msword. and i need a long - ( long hyphen)

well it looks like - (the key on the keyboard between the zero 0 and +)
but in books the dash is longer.. . if i press it twice it make two dashes and no one long one. --
how do i get this? is it a keyboard shortcut of something i have to insert. even font styles doesn't make a difference.
please help????????????
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