The document summarizes key differences between services and goods. Services are intangible, heterogeneous, produced through customer interaction, and cannot be stored. Goods are tangible, homogeneous, produced in factories separately from distribution and consumption, and can be stored with ownership transferred. The document then discusses various ways services can be classified, including by industry, target effect, skill level, labor intensiveness, degree of customer contact, and goal of the service provider. Finally, it provides examples to illustrate classifications by target effect and skill level of service provider.