What is the difference between the HS code and HTS code ?

Harmonized codes (or tariffs) are an international customs classification system now used by most trading nations throughout the world. HS Codes are commonly used throughout the export process for goods. The Harmonized System is a standardized numerical method of classifying traded products. A code with six digits is the universal standard HS Code, whereas a code with seven to 10 digits is an HTS Code.