eClassOWL - The Web Ontology for Products and Services is an OWL ontology for describing the types and properties of products and services on the Semantic Web (also known as the "Web of Linked Data"). It defines classes for more than 30,000 product types and more than 5,000 properties for product features.

eClassOWL is meant to be used in combination with the GoodRelations ontology for e-commerce, which covers the commercial aspects of offers and demand, e.g. prices, payment, or delivery options.