The type or specific product(s) and/or service(s) being incentivized. DefinedTermSets are used for product and service categories such as the United Nations Standard Products and Services Code: ``` { "@type": "DefinedTerm", "inDefinedTermSet": "https://www.unspsc.org/", "termCode": "261315XX", "name": "Photovoltaic module" } ``` For a specific product or service, use the Product type: ``` { "@type": "Product", "name": "Kenmore White 17" Microwave", } ``` For multiple different incentivized items, use multiple [DefinedTerm](https://schema.org/DefinedTerm) or [Product](https://schema.org/Product).