Briefly Describe the Four Primary Functional Areas of a Firm

Briefly describe the four primary functional areas of a firm. How is operations related to them?
The four primary functional areas of a firm are marketing, finance, operations, and human resources. For most firms, operations is the technical core or "hub" of the organization, interacting with the other functional areas and suppliers to produce goods and services for customers. For example, marketing provides sales forecasts to operations and operations provides marketing with product availability information, lead time estimates and delivery schedules. Operations provides finance with inventory and production data, capital budgeting and equipment requests, and technology plans. Finance provides the capital resources for financing inventory and securing more capital equipment. Operations relies on human resources to meet its personnel needs-hiring, training, and evaluating workers.