With industry classification codes, you can find business statistics, compare companies within the same industry, and locate industry reports and articles.
Quick research tip: If you are having trouble determining the appropriate NAICS or SIC codes, try searching for a few companies within your industry of interest in a company database. Note the industry codes associated with those companies and then go back to the industry classification system to review the official industry code definitions in order to determine which codes may be most appropriate for your research.