In the paper, "Leadership as a managerial function and foundation for success in organizations" is about concept and leadership process and leadership key dimensions. This paper gives an overview of several models or approaches to leadership such as access to features, situational approaches, and style-based leadership approaches from different behaviors of leaders and managers within their work procedure that affects the goals and results of specific organizations. Choosing a certain style of leadership depends on certain characteristics that the leader has, and the factors that come from the subordinates and the circumstances. Style of leadership that is universal to each organization does not exist but it is necessary to implement leadership style in accordance with the required situation. Paper shows the influence of power in organizations that empowers the leader to make key decisions in the organization, and influences them to compare and direct employees work and their behavior. The short historical context presents some of the leadership theories and the culture influence on the process of leadership. In addition, the characteristics of the leader and the characteristics of the manager are described in details, and management through influence on the organization. Apart from the characteristics, this paper analyzes the differences between leadership and management, leaders and managers. Modern approaches to leadership that made up one of the main chapters of this paper are presented in the context of application in organizations that have a significant impact on achievement of success. Modern approaches to leadership point out the special component that leaders want to convey to their employees in the organization, a motivating vision that triggers the entire organization. Motivational factors and the ethical component that is essential to a successful organization is has been presented as one of the elements of this paper. This paper gains essence through exploration through a deep interview that provides a comprehensive analysis of leadership and why it is so crucial to organizational structures. Ultimately, the paper presents leaders and leadership styles in today's time that are the basis for the successful future of many organizations.