To begin, the industry can be thought of the external environment in which a company operates - think regulatory concerns, macro-economic cycles, and availability of raw materials. The market consists largely of the other players involved - customers, competitors, substitutes, etc. When researching the industry and/or market a company is operating in, it can be helpful to go from broad to narrow.
It can be useful to define the industry as clearly as possible and this is often done by locating the appropriate North American Industrial Classification System (NAICS) number for the industry. The NAICS code is a 2- to 6-digit number that identifies the core activity associated with the product or service and can help you identify relevant competitors, suppliers, and customers for a given industry. You can also use the SIC code, although the NAICS is becoming more common as time goes on.
Once you have defined your industry, starting with broad industry and market overviews, then moving to more and more narrow components and aspects of the industry or market, can be an efficient strategy for your research.
In addition to the databases listed here, I recommend you also check out the Richard K. Miller Market Research Handbooks (if your focal market or industry is represented). These are eBooks available through the library and the titles include:
You can use Google to find relevant trade/professional organizations for you industry. Try searching
[industry ("trade organization" OR "trade association" OR "professional organization" OR "professional association") site:.org]