One of the benefits of DDD is the fact that it encourages and improves communication. Communication among all team members is encouraged. In particular, DDD stresses the importance of interacting with domain experts.
A domain expert, or subject matter expert (SME), is someone who possesses expertise about, and is an authority in, a particular area. Understanding the domain of your software application is highly beneficial and domain experts will help the entire team gain this understanding.
In addition to encouraging communication with domain experts, DDD improves communication among all team members and stakeholders by introducing the concept of a ubiquitous language.