Working capital refers to a company's short-term assets and liabilities related to day-to-day operations. It includes current assets like inventory, receivables, and cash, as well as current liabilities like payables. Managing working capital involves setting policies for maintaining optimal levels of current assets and financing them appropriately through short-term debt or long-term sources. The objective is to ensure sufficient liquidity while maximizing returns through efficient management of components like inventory, receivables, and payables.