A harmonized code database is typically a list containing the Harmonized System Database code numbers that are associated with item categories. An HS database is generally similar across multiple countries, but may contain slight differences in regards to how items are categorized.
Certain harmonized code databases also includes a search function that allows users to input an HS code number to pull up related information. This information is generally related to tariffs, import rates and prohibitions associated with the product. As of 2015, the Harmonized System database is made up of approximately 5,300 product descriptions that are grouped into 99 chapters and 21 sections.