Definition
NAICS Code North American Industry Classification System code identifying business industry.
Definition
A NAICS code is a 6-digit number that classifies a business by its primary industry. NAICS codes determine small business size standards and which contracts you're eligible for. Your primary NAICS code should reflect your main revenue-generating activity. You can list multiple secondary NAICS codes in SAM.gov.
Official Source
U.S. Census Bureau
