Business Domain

In DDD, we focus on the business domain. Logic involving the business will be prioritized as the focus, which might need a lot of discussion with domain experts.

For example, if you're building a banking system, the business logic is about how to calculate savings and loans interest. As software engineers, while we might know a thing or two about savings and loans, it is more appropriate to have domain experts in this case, bankers, to help us build the system. It is quite important to be in the same table as domain experts and make a model (representation of the business domain) based on the discussion.

The technology behind the system such as programming languages, frameworks, or libraries is not the focus here.