An ellipsis [ … ] proves to be a handy device when you're quoting material and you want to omit some words. The ellipsis consists of three evenly spaced dots (periods) with spaces between the ellipsis and surrounding letters or other marks. Let's take the sentence, "The ceremony honored twelve brilliant athletes from the Caribbean who were visiting the U.S." and leave out "from the Caribbean who were":
The ceremony honored twelve brilliant athletes … visiting the U.S.
If the omission comes after the end of a sentence, the ellipsis will be placed after the period, making a total of four dots. … See how that works? Notice that there is no space between the period and the last character of the sentence.
See full article at http://grammar.ccc.commnet.edu/grammar/marks/ellipsis.htm