What is the difference between alt text and a caption?

FieldWho sees itUse it for
Alt textScreen readers, search engines, and readers whose image fails to loadDescribing what the image shows. Required.
CaptionEvery reader, as small text under the imageContext, a source, or a photo credit. Optional.

Write alt text as one plain sentence describing the picture, without "image of". Click Describe with AI to have it written for you. See Generate images and alt text with AI.