Technical Definition
Alt text (alternative text) is an HTML attribute describing image content for accessibility and search engines. Used when images can't display, by screen readers, and for Google image understanding. Best practices: be descriptive and concise, include relevant keywords naturally, don't keyword stuff, describe the image's function if decorative (or use empty alt=''). Critical for image SEO and accessibility compliance.
Simple Explanation (ELI13)
Alt text is a description you write for images. It's read aloud by screen readers for blind users and shown when images fail to load. Google also uses it to understand what images show. Write descriptions like you're explaining the image to someone who can't see it. Don't just stuff keywords in there.
Related Terms
Image SEO, Accessibility, Google Image Search
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