The HS is composed of 21 Sections, with each Section referring to a specific product group.
Each Section is further divided into Chapters. There are 97 HS Chapters.
Each Chapter in turn is divided into tariff headings and tariff subheadings.
The product coverage of a Section and Chapter can be discerned from their titles.
In addition, there are (a) Section Notes and (b) Chapter Notes, found at the beginning of each Section or Chapter, which provide further information on product coverage. These Notes may contain definitions, products that are covered, as well as products that are excluded from the Section or Chapter.