main goal

An industry is a specific category of businesses that share similar primary economic activities, production processes, or revenue sources. Economies categorize these activities using structured frameworks—such as the North American Industry Classification System (NAICS) or the Global Industry Classification Standard (GICS)—to break down economic output into distinct industry types and product types. The Four Main Industry Types

Economists divide industries into four primary evolutionary tiers based on their role in the production chain:

Industries in Alphabetical Order : U.S. Bureau of Labor Statistics