Schema markup seo - what is it?

it's a block of code (usually json-ld in the page head) that labels what's on the page in a way google can read without guessing. this is a product, price 40, 4.6 stars from 200 reviews. this is a business, open 9 to 5, at this address. these are faqs. what it's for: the extras in search results (stars, prices, faq dropdowns), and helping google be sure what an entity is. yoast or rank math add the basics on wordpress, and google's rich results test tells you if what you added is valid.