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Professional, trade, and industry associations will often have detailed information on their stakeholder groups and target customers. Use the resources on this page to find industry associations and access their research and publications.
An industry is a group of companies that are related in terms of their primary business activities. In modern economies, there are dozens of different industry classifications, which are typically grouped into larger categories called sectors.
Individual companies are generally classified into industries based on their largest sources of revenue. For example, an automobile manufacturer might have a small financing division that contributes 10% to overall revenues, but the company will still be universally classified as an auto maker for attribution purposes.
Source: Investopedia
http://www.investopedia.com/terms/i/industry.asp#ixzz48qlv6zSM
Find NAICS and SIC codes for a specific industry using one of the resources below: