JSON-LD (JavaScript Object Notation for Linked Data) is a lightweight data format used to structure and link data on web pages. Designed for easy integration with HTML, JSON-LD allows website owners to embed machine-readable metadata directly into their content. This structured data helps search engines better understand the context and relationships within a page, improving how information is indexed and displayed in search results. JSON-LD is widely recommended for SEO because it is simple to implement, does not interfere with page content, and supports a variety of schema types for enhanced search visibility.