The North American Industry Classification System (NAICS) is an industry classification system. It has a hierarchical structure, dividing the economy into 20 broad sectors. Within each of these sectors, economic activities are further organized into narrower categories.
For example, this is a snapshot of the NAICS hierarchy for the Resorts industry:
NAICS codes may be used in some library databases to search for industry reports, company profiles, or to create lists of companies.