Here's a breakdown:
* Dek: Short for "deck," this is the most common term and refers to a brief summary or introductory sentence that follows the headline. It provides more information about the article's content.
* Deck: This term is also used interchangeably with "dek" and means the same thing.
* Lead: Sometimes, the sentence under the headline is referred to as the "lead," but this term is more broadly used to describe the opening paragraph of a news article or story.
The terms "dek," "deck," and "lead" are often used interchangeably in journalistic writing.