Final answer:
Middle managers are responsible for major departments and may supervise other lower-level managers. They serve as intermediaries in an organizational hierarchy, implementing executive strategies and overseeing first-line managers.
Step-by-step explanation:
Individuals responsible for major departments and who may supervise other lower-level managers are typically known as middle managers. These managers act as an intermediary between executive managers, who lead the entire organization or significant divisions, and first-line managers, who oversee the day-to-day operations. Middle managers play a crucial role in implementing the strategies set by executive management and coordinating the efforts of first-line managers to achieve organizational objectives. They frequently possess specialized knowledge in a particular field and have responsibilities that may include setting departmental goals, allocating resources, and evaluating the performance of lower-level managers and employees.