Colon, << KOH luhn, >> is a mark of punctuation shown as :. Its primary function is to separate an introduction from what it introduces: a list, a long quotation, an illustration, or an explanation. A colon is most often used when the words preceding it form a complete sentence, as in the second sentence of this article. There are two exceptions. A colon ends the formal opening of a business letter, and it may be used after the main headings of an outline. See also Punctuation .
