Agile teams succeed through process but also through how they relate, learn, and grow together. This chapter explores the critical shift from transactional communication to genuine collaboration, where knowledge is actively shared, trust forms the basis of team interaction, and psychological safety is a necessary condition rather than an optional ideal. Drawing on research, team practice, and lived experience, it examines how effective collaboration goes beyond coordination to become a process of co-creation. Agile teams that thrive do more than follow rituals and use tools. They embed trust into their day-to-day routines, their decisions, and their feedback practices. They treat knowledge as a collective asset, built through openness, reflection, and mutual respect. The chapter identifies collaboration patterns and anti-patterns, explores the role of leadership in fostering safety, and presents practical strategies for designing teams that prioritise learning, inclusion, and resilience. High-performing Agile teams are technically competent. They are intentional in how they work together. Collaboration is not a supplementary activity. It is the core of how Agile teams learn, adapt, and succeed. When collaboration is done well, Agile teams build software. But they also build capability, cohesion, and shared intelligence.