An industry is a classification for a group of companies that conduct similar business activities and produce related products or services. Economists and major classification frameworks—such as the North American Industry Classification System (NAICS)—typically organize these activities by their role in the production process and the types of products they deliver.
Understanding how industries and product types are structured helps businesses strategy, market analysis, and career planning. The Four Main Economic Sectors
Industries in Alphabetical Order : U.S. Bureau of Labor Statistics
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