Communication is essential for developers. It involves exchanging information with product owners to clarify technical stories, sharing knowledge with colleagues, and asking for help when needed. Different modes of communication include written, spoken, and body language. It is important for developers to communicate effectively with both other developers and non-technical partners. When disagreements occur, the goal should be constructive discussion and understanding different viewpoints. Developers must also learn to communicate boundaries by saying "no" respectfully when facing unreasonable requests. Overall, strong communication skills are key to developing better work relationships and enjoying one's job more.