Working capital refers to the capital required to run the day-to-day operations of a business. It includes current assets like inventory, cash, and accounts receivable as well as current liabilities like accounts payable. There are different types of working capital like gross vs net and permanent vs temporary. Over 50% of a company's capital is typically in the form of working capital. It is financed through various sources like trade credit, bank financing, and working capital loans. Factors like the nature of the business, production policy, market conditions, and growth strategies can affect a company's working capital needs.