The Harmonized System (HS) is an internationally standardized system for classifying traded products that came into effect in 1988. It is organized into 21 sections and 96 chapters with up to 8 digits assigned for tariff levels and 2 additional digits for statistical reporting. Over 200 countries follow the HS system to classify over 98% of international merchandise trade. The HS coding structure and Indian customs duties for some products are provided as examples. It is used for purposes such as customs tariffs, trade statistics, rules of origin, and monitoring of controlled goods.