One or more images across your site do not have alt text - a short written description attached to each image in the page code.
Why this matters
Alt text serves two critical purposes: it is read aloud by screen readers used by visually impaired visitors, and it is the main way search engines understand what an image depicts. Missing alt text makes your site less accessible and reduces the SEO value of your images.
How to fix it
For each image missing alt text, add a brief description of what the image shows. Decorative images that add no meaning can use an empty alt attribute (alt="") to tell screen readers to skip them. A developer can audit all images in bulk using accessibility scanning tools.
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