Photo captions, also known as cutlines, are a few lines of text used to explain or elaborate on published photographs. In some cases captions and cutlines are distinguished, where the caption is a short (usually one-line) title for the photo, while the cutline are a longer, prose block under the caption, generally describing the photograph, giving context, or relating it to the article.
Captions more than a few sentences long are often referred to as a "copy block". They are a type of display copy. Display copy also includes headlines and contrasts with "body copy", such as newspaper articles and magazines.
- The Art of Editing, by Floyd K. Baskette, Jack Z. Sissors, and Brian S. Brooks