Adding short text descriptions or dialogue below images or video; the text itself that explains what's happening.
From 'caption,' which comes from Latin 'captio' (seizure) but evolved to mean the heading of a legal document, then the title of a picture, then text that 'captures' the meaning of an image.
Closed captioning was invented in the 1970s mainly for deaf viewers, but now it's become essential for millions of people watching videos without sound in public spaces, making it one of the most useful accessibility features that accidentally became mainstream!
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