What's the difference between Service and Product schema?

Service schema is for the intangible things you do, like a haircut or a consultation. Product schema is for the tangible things people buy. Mark up each page for what it actually is, and if you offer both, use both.

Is Service schema worth adding if Google doesn't document it?

Yes. It won't earn you a rich result, but it gives search engines and AI tools a clear, structured description of each service you offer, which helps them understand and surface what you do. It's low-effort once your foundational schema is in place.

Do I need to add Product schema if I use an e-commerce platform?

Often not. Most e-commerce software generates Product schema automatically. Test one of your product pages in Google's Rich Results Test, and if it reports a product, you're already covered.

Can I show star ratings on my services?

Not through Service schema, which doesn't produce rich results. Star ratings show up through Product schema, and only when you have genuine customer reviews on that product page. You also can't star-rate your business as a whole.

Where does the provider or seller information come from?

From your foundational schema. Your Service block's provider and your Product block's brand or seller both point back to your LocalBusiness or Organization block using its ID, so you never have to retype your business details.