The document compares the key differences between marketing products and services. Products are tangible, homogeneous goods that are produced separately from consumption, while services are intangible, heterogeneous activities where production and consumption occur simultaneously through buyer-seller interaction. The core value of products is produced in a factory, while the core value of services is produced through buyer-seller interaction and customer participation in the production process. Products can be kept in stock, while services cannot be kept in stock as they involve the transfer of ownership.