Practical explanation:
Alt text helps people who can’t see images understand what’s on the page, and it also helps search engines interpret images correctly. Instead of describing every detail, good alt text focuses on what matters most in context—what the image represents and why it’s there.
How it’s used in practice:
Alt text is added when uploading images to a website or CMS. For example, a product image, infographic, or illustration should have a clear, meaningful description. Well-written alt text supports accessibility, improves SEO, and prevents lost context when images fail to load.
When to use it:
Alt text should be used for all important images on a website, especially those that add meaning to the content. Decorative images can be left empty, but images that support content, SEO, or user understanding should always include alt text.
Related terms:
Accessibility, SEO, On-page SEO, Images