Big Picture
A Domain, in the broad sense, is what an organization does and the world it does it in. Businesses identify a market and sell products and services. Each kind of organization has its own unique realm of know-how and way of doing things. That realm of understanding and its methods for carrying out its operations is its Domain. When you develop software for an organization, you are working in its Domain. It should be pretty obvious to you what your Domain is. You work in it.
One thing to be aware of is that the term Domain may be a bit overloaded. Domain can refer to both the entire domain of the business, as well as just one core or supporting area of it. I will do my best to distinguish each use of the term. When referring to just ...
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