Final answer:
Informal leadership is typically found in small, primary groups where leadership is not formally established through voting or assigned roles. In contrast, formal leadership is more common in secondary groups, such as workplaces or classrooms, where leaders have clearly outlined roles and responsibilities.
Step-by-step explanation:
Informal leadership is typically found in small, primary groups where leadership is not formally established through voting or assigned roles. In contrast, formal leadership is more common in secondary groups, such as workplaces or classrooms, where leaders have clearly outlined roles and responsibilities. Therefore, the definition of leadership that appears to exclude informal leadership is one that emphasizes formal roles and structures within groups.