If you've ever wondered why some Google results show star ratings, prices, FAQs, or rich snippets — while yours just shows a plain blue link — the answer is usually structured data . It's one of the highest-leverage SEO techniques available to developers, and it's almost entirely skipped in most beginner-to-intermediate SEO guides. Let's fix that. What is structured data? Structured data is machine-readable information you add to your HTML that tells search engines exactly what your page is about. Think of it as a translation layer between your human-readable content and Google's crawlers. Instead of guessing that your page sells a product, Google knows — because you told it in a format it understands.…