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A corporation is a legal form of business organization wherein the firm's owners or stockholder have limited liability.
Weighted Average Cost of Capital (WACC)
A company's assets are financed by either debt or equity. WACC is the average of the costs of these sources of financing, each of which is weighted by its respective use in the given situation. By taking a weighted average, we can see how much interest the company has to pay for every dollar it finances.
A firm's WACC is the overall required return on the firm as a whole and, as such, it is often used internally by company directors to determine the economic feasibility of expansionary opportunities and mergers (definition courtesy of Investopedia).