Managers are those employees entrusted with managerial functions within the organization. Management functions involve planning, policymaking, strategizing, leading, and controlling.
Managers can be found at any level in an organization and in any division.
They include managers who are entrusted to frame the vision and decide the overall policy of the organization as a group. A top manager may also be found to serve on the board of directors for a company. Examples of top-level management positions include Chief Executive Officer (CEO), Chief Financial Officer (CFO) etc.
Middle management employees oversee the specific department functions within an organization. They also oversee lower-level managers and serve as a liaison between top-level management and lower-level management. Examples of middle management roles include Director of operations, Director of finance, etc.
Supervisors typically have a supervisory role and oversee the functioning of smaller specific areas within an organization. They report to middle management and are responsible for smooth operation of daily business activities. Examples of lower-level management include, supervisors, supervisors, section leads, line manager on the production floor etc.
Basically, management employees oversee the working of groups of employees or specific groups of functions within an organization.