Hello Kim! You have a good question here. The ellipsis (...) is used when you are quoting and want to omit words in a statement. The words to be omitted are deemed to be unimportant / non-essential for the message that you want to impart. Example: The ceremony conducted was part of the agreement...signed by the diplomats.

http://www.thefreedictionary.com/ellipsis There are hundreds of examples, even rules, regarding ellipsis.