Caption
/ˈkæp.ʃən/
noun
The descriptive heading or title of a document or part therof
A title or brief explanation attached to an illustration, cartoon, user interface element, etc.
A piece of text appearing on screen as subtitle or other part of a film or broadcast.
verb
To add captions to a text or illustration.
“Only once the drawing is done will the letterer caption it.”
To add captions to a film or broadcast.