Generally, Ellipsis is a sequence of marks that usually show an intentional oversight of a word, sentence or whole section from the original text being quoted.
An ellipsis can also be used to indicate an unfinished thought or, at the end of a sentence, a trailing off into silence,
For example: “I am sure he has . . .”
When ellipsis is placed at the beginning or end of a sentence, it can also inspire a feeling of depressed or longing. The ellipsis calls for a slight pause in speech or any other form of text, but it is incorrect to use ellipsis only to indicate a pause in speech.
The most common form of an ellipsis is a row of three periods or full stops (. . .) or a pre-composed triple-dot glyph (…).
In writing, it is used to build tension or show that the sentence has been left unfinished. The three dots of an ellipsis (…) are often used in texts when an author wants to use only part of a long quotation.