Whats the "-" for?

So what the heck is the - (dash) for? Well, I guess it does a good job of separating a thought that is kind of related, almost like the parenthasis. For example: Jack, you are too overbearing - stop being overbearing! Thats is about the onlything I can think of... SOOOOO.... To the Web. HERE is the Page. Short and Sweet. Says about the same thing in so many words. Time for bed now.