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NAICS and SIC codes help classify and measure industry activity. Knowing the code for your industry will help you find articles, and other information on that industry.
The NAICS (North American Industry Classification System) is gradually replacing the Standard Industrial Classification (SIC) system.
Even though the codes are standardized, different resources will assign codes differently. Additionally, many companies can have multiple codes because of their various business segments. Be careful when using codes to search, and always check multiple sources.