Structured Data is a standardized format for annotating your web content so machines—search engines and AI models—can easily parse and understand its meaning. JSON-LD (JavaScript Object Notation for Linked Data) is the recommended way to embed that metadata: you place a <script type="application/ld+json"> block in your HTML that uses schema.org vocabularies to define entities (products, people, events, etc.) and their relationships. For AI SEO, well-crafted JSON-LD signals to LLM-powered systems which concepts and entities your page covers, helping ensure your content is recognized, contextually indexed, and more likely to be cited in AI-driven answers, knowledge panels, and zero-click results.