And a leader is the link between the organization and the employee and he is the person who leads the group, therefore he is the core of the team. But for them, it is not easy to lead a team to achieve its goals, due to not only internal but also external factors. Leaders face many challenges, such as globalization and communication. However, these challenges could be addressed by leaders in the right way. And then, there are so many types of team leaders who can choose, so depending on the organizational conditions, they form the best type. Additionally, we also discuss the Human Relations Movement, what it is, who finds it, and how they research to find it. And this theory gives the leader a clear path on how you should do to make your team more