If you're new to industry research, here's a quick question to ask about your industry (or your product):

What is the NAICS or SIC code for it? 

Is there even a classification code for it at all?  So ...

What are these codes?

They are numeric codes, usually 2-6 digits in length.

What do they do?

They are keys to descriptions and definitions for an industry or product.

What are they used for?

They are used for the collection, organization and publication of data about an industry.

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Knowing whether or not there is an industry classification code specific to your industry or product will often help you know where to look for information about your company, and how much information you can expect to find. See below for more explanation ...