: a short piece of usually hidden text that is associated with a digital image on the Internet (as to provide a description of the image for people with visual disabilities)
Some accessibility advocates have also called for Twitter to give users the ability to add text descriptions of images—known as "alt text"—to tweets after they've been posted. That would allow blind people and others to understand tweets with visual elements by using technology that reads such descriptions aloud.—Rachel Lerman and Will Oremus
For the Webb telescope images, a large team of science writers, outreach scientists, and education specialists at the Space Telescope Science Institute helped write and edit alt text and the longer image descriptions.—Sarah Scire
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Merriam-Webster unabridged
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