Standard Industrial Classification Codes, or SIC Codes, are numerical codes used to categorize businesses based on their primary activities. Developed in the United States, these codes help government agencies, researchers, and businesses analyze economic data and trends. Each code corresponds to a specific industry, making it easier to identify and compare similar businesses. The SIC system was established in the 1930s and has been updated over the years to reflect changes in the economy. Although it has largely been replaced by the North American Industry Classification System (NAICS) for many purposes, SIC Codes are still used in various applications, including regulatory compliance and statistical analysis.