Schema.org is special markup you use to label a page's content so search engines understand its meaning: where the price is, the review, the author, the recipe. People can see this anyway, but a robot needs it spelled out.
Marked-up pages get a richer look in search: rating stars, price, availability, answers right under the link. That kind of result stands out and pulls more clicks. In effect you take up more space on screen without moving up in position.
ChatGPT, Perplexity and Google AI read structured data to quickly grasp what a page is about and whether they can cite it. Clear markup raises the odds an AI pulls its answer from your site rather than someone else's.
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