JSON-LD (JavaScript Object Notation for Linked Data) is a lightweight, W3C-recommended format for expressing structured data in a way that is both machine-readable and easy for humans to write. It encodes facts, entities, and their relationships as linked data using JSON syntax, making it ideal for embedding semantic context directly into a webpage’s <script> tag.

In AI Search Optimization, JSON-LD is the preferred method for exposing your content’s entities, attributes, and relationships to search engines, large language models (LLMs), and knowledge graphs. By explicitly defining this information in a standardized schema (often using Schema.org), you help AI systems accurately interpret and connect your content to related concepts, improving retrieval, citation, and entity authority.