What is a Chamber? Or a Business Club?
A Chamber of Commerce (also referred to in some circles as a Board of Trade, though this phrase is not commonly used in the United States) is a form of business network. The primary goal of a chamber is to improve the business climate in a locality, typically through business networking, lobbying, and common projects and a selection of business services.
Q: What is a Business Club?
A: Pretty much whatever it wants to be, I guess!