Leadership is defined as the ability to influence people to achieve group goals. It is a process of social influence where a leader influences subordinates. Effective leadership requires certain qualities and traits like good personality, communication skills, courage and initiative. Leadership styles may change based on circumstances. Transactional leadership relies on rewards and punishments to motivate followers, while transformational leadership inspires followers towards a common goal and changes their perceptions. Different theories explain leadership from traits, behaviors, situations and relationships between leaders and followers.