DDD means Domain Driven Design. Domain, as in a domain of knowledge – not to be confused with your web domain. What this really means, however, is that you make stuff for a specific purpose. If you’re in the business of selling cars, your custom software will be created to acknowledge tire size, engine power etc.
As the agile methodology and object programming had made their way to the minds of the non-programmers, the Domain Driven Design is still a foggy term. Yet, it may be the best way to handle the most significant and most complicated IT projects. The concept of Domain Driven Design was born when Eric Evans published the book of the same title.