The difference between a manager and a leader

What is the difference between a manager and a leader?
How are ethics and leadership related to each other? (CLO-2)
How does the consideration of ethics impact your decision making? (CLO-3)
How does corporate culture including social responsibility impact ethics and ethical decision making? (CLO-6)
Can you give examples of how ethics effect areas of your organization such as marketing? (CLO-9)