Cash flow refers to the flow of cash into and out of a business over time. Cash can flow into a business through the sale of goods or assets, payments from debtors, borrowing, or investments. Cash flows out when purchasing goods, paying wages, buying assets, repaying loans, or paying creditors. Cash flow forecasts estimate future monthly cash inflows and outflows to show expected cash balances. They are used for starting, running, and managing businesses, and keeping banks informed. Terms include opening balance, closing balance, and net cash flow. While cash flow and profit are different, cash flow problems can be addressed through bank borrowing, reducing expenses, increasing income, or delaying payments.