 Graphene oxide, GEO, is a material with unique physical and chemical properties which has been gaining increasing attention due to its potential applications in various industries. However, there is currently no consistent definition or classification of GEO, making it difficult to compare and evaluate different types of GEO. This paper provides a comprehensive review of 34 commercially available GEOs, characterizing them according to their physical chemical properties and applications. The results show that GEO can be divided into two main categories based on their surface area and oxygen content. Furthermore, the authors propose a classification scheme for GEO based on these parameters, providing a framework for future research and industry standards. This article was authored by Katazina Zedonotto, Huilitan, Valeria S. Marangoni, and others.