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Text that describes an image for screen readers and fallback contexts.
Alt text should communicate the image’s useful meaning, not every visual detail. Decorative images can use empty alt text so assistive tech skips them.
Plainly
Think of Alt Text as a named building block in a big LEGO app. Text that describes an image for screen readers and fallback contexts.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.