Industry reports can give you an idea of what is going on in an industry. Some of the things you can do with the information you get from them is determine trends and identify the type of competition in the industry.
NAICS is the North American Industry Classification System, a standard implemented in 1997 for classifying industry, product, and establishment. Use this site to find your industry NAICS code. Click on the relevant code to read its description and to ensure that you have the right code.
Standard Industrial Classification (SIC) is an industry classification system in which all Federal economic statistics are based on up to 1996. Use this site to do a keyword search to find an SIC code for an industry.