What exactly is a business school

What exactly is a business school?
I always thought it's for postgrad students that want to do an MBA or some business relevant masters. That's what I thought. But now I'm a bit confused. For instance. Macquarie University in Australia offers a Master of International Business and a Master of Commerce. But it's taught by the faculty of Business & Economics and not their business school. At other schools the same majors are taught by the business school. So why are some of these Masters offered by the university and others such as the MBA always by the Business School?
Higher Education (University +) - 1 Answers

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The subjects are different - MBA is more technical - if it wasnt for the fact it was a Masters degree it would be taught at a TAFE (which is what the business school sorta is). The other Masters offer insight in how to negotiate in international situations, policy formation etc which is part of the university background/culture.