The role of a leader within a team environment is crucial for achieving team success and organizational goals. Recently, there has been a shift from leadership theories based on personal traits and skills towards theories emphasizing the evolution of relationships between employees and team members. The Leader-Member Exchange theory emphasizes the importance of the relationship between a leader and a member, highlighting that these relationships are not uniform but vary in intensity, ranging from high-quality to low-quality connections. On the other hand, team cohesion represents the strength of bonds within a team, reflecting the level of interconnectedness, solidarity, and unity within the team framework. The correlation between these two components, the leader-member exchange and team cohesion is crucial for better understanding the dynamics of team relationships. This research aims to explore the interaction between the Leader-Member Exchange theory and team cohesion, focusing on their interconnection, the influence of one on the other, and how these variables shape the work environment and team effectiveness. Different relationship-based leadership approaches will be analyzed, including the Leader-Member Exchange theory, determinants of teamwork, and the correlation between Leader-Member Exchange theory and team cohesion. The empirical part of the research will examine the assumption that high-quality relationships between leaders and team members often result in increased team cohesion, which can enhance communication, collaboration, and overall work atmosphere.