What is the Difference Between Leadership and Management?
Management is the process and tasks related to setting and achieving goals.
Leadership is working through others to get things done.
Leadership is one of Management's Four Parts
Are all managers also leaders?
Some managers may do all the work themselves and thus are not leaders.
An example would be a sole accountant. She may set and plan goals, organize the work, and track progress, but she isn't required to lead since she doesn't work through others.
Are all leaders also managers?
Some leaders may not plan, organize, or control and thus are not managers.
An example would be a software team lead. He may use his expertise to influence others to get things done, but he isn't required to plan or control.