What impact does optimizing image Alt text have on image search and accessibility?

When adding accurate Alt text to images, it not only improves the visibility of images in search engines but also enhances the accessibility of content for visually impaired users, serving as a fundamental practice that balances search optimization and inclusive design. Image Search Optimization: As a core signal for search engines to crawl image content, Alt text with a clear description of the subject (e.g., "children's hand-drawn cartoon animal illustrations") helps algorithms understand the image theme, improves the match with user search queries (e.g., "cartoon animal drawing materials"), and thereby increases ranking and exposure opportunities in image search results. Accessibility Enhancement: When visually impaired users browse web pages using screen readers, Alt text is converted into speech or Braille to accurately convey image information (e.g., "data chart showing a 20% monthly website traffic growth"), preventing users from missing key content due to inability to view images and complying with Web Content Accessibility Guidelines (WCAG) requirements. For optimization, it is recommended to prioritize describing the core content of the image, avoid redundant words like "图片" (picture) or "image", and use empty Alt text (alt="") for purely decorative images to reduce interference. Appropriate Alt text can both help drive traffic through image searches and allow content to reach a broader user base.