Technical Definition
Alt attribute (alt text) describes image content for screen readers and when images fail to load. SEO relevance: helps search engines understand image content, appears in image search. Best practices: be descriptive but concise, include keywords naturally (don't stuff), describe what's in the image. Empty for decorative images.
Simple Explanation (ELI13)
Alt text describes what's in an image for people who can't see it and for search engines. Write a clear, concise description of what the image shows. Include relevant keywords naturally but don't stuff them in. Screen readers read alt text aloud, so make it useful for real people.
Related Terms
Image SEO, Accessibility, On-Page SEO, Image Search
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