What it is
JSON-LD stands for JavaScript Object Notation for Linked Data. In plain terms, it is a tidy block of code you place in a page that labels your content: this is a product, this is its price, this is the author, this is the FAQ. It lives separately from the visible page, so it does not change how the page looks to a reader.
Why it matters
JSON-LD is the format that carries your facts to the search-engine and AI-system audiences. Google recommends it over older methods, and AI tools that read structured data parse it cleanly. Marking up content in JSON-LD is one of the most direct ways to make a page machine-readable, which is what gets it understood and cited instead of guessed at.
What to do
Add JSON-LD to your most important pages first, matching the schema type to what the page is: Product, Article, FAQPage, HowTo, or Organization. Validate it with Google's Rich Results Test, and keep the markup accurate when the page changes.