An ellipsis indicates that some part of the text has been omitted. Many writers are confused about when to use an ellipsis, and use a dash instead—or visa versa. You will most often see an ellipsis in poetry when the writer must leave out a word or two to keep a correct meter. You will also use them in the middle of quotes when you are leaving out portions of the quote to save space or because some of it is not relevant to your point. An ellipsis is always indicated by three dots with a space between each, plus a fourth if a period is needed to indicate the end of the sentence. For more than you ever wanted to know about the ellipsis, go to: http://www.quickanddirtytips.com/education/grammar/ellipses?page=all.