Cash flow is the net amount of cash and cash equivalents moving into and out of a business over a period of time. Positive cash flow indicates that a company's liquid assets are increasing, while negative cash flow means they are decreasing. Cash flow comes from cash receipts from customers and cash uses like payments for expenses. Maintaining adequate cash flow is important for businesses to avoid failure. Cash flow statement categorizes cash sources and uses into operating, investing, and financing activities. Operating activities involve production and sales. Investing activities involve capital expenditures and investment purchases/sales. Financing activities involve obtaining funds through debt and equity issuance or repayments.