Schema markup enhances SEO for affiliate sites by providing structured data that helps search engines understand content more effectively. By using specific schema types—such as Product, Review, or Offer—affiliate sites can highlight key elements like prices, ratings, and availability. This increases the chances of rich snippets appearing in search results, improving visibility and click-through rates. For affiliate marketers, this is crucial in a competitive landscape, as enhanced listings attract more traffic. Schema also ensures that content aligns with search engine algorithms, reducing ambiguity and improving indexing accuracy. Additionally, schema markup can signal trust and authority, which are important for both rankings and user engagement.