Ellipsis from a Greek word meaning "omission" or "falling short" is leaving something out, this is noted in punctuation by three consecutive periods (...) whereas the dash signifies an interruption. But an ellipsis can also be accomplished without the marks. "Nice day," is ellipsis for "Have a nice day," and "Can do," is ellipsis for... Well, you get the idea.
I have more to say on the topic, but in the spirit of ellipsis, I won't.
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