A caption provides context and information about an accompanying image by detailing who or what is featured, when and where the image was taken, and why. Captions serve to enhance visual communication by supplying additional details not evident from the image alone. They complete the picture, establish credibility by citing sources, and boost engagement by encouraging viewers to examine the image more closely. Captions have a title, lead paragraph, and may include section headings. They use language features like prepositional phrases, participial phrases, and questions/exclamations to provide insights. Common types are identification bars, cutlines, summaries, and expanded captions.