The cash flow statement shows the cash position of the company, the change in the cash position from the past year and how well the company is doing when it comes to converting sales into cash and reducing the cash payments while maintaining robust the day to day operations.
Analysing the cash flow statement (by using ratios for example), you can see if the company has the ability to repay the debt that it will be due soon from cash reserves, if it can meet other short term liabilities (interest expenses, trade creditors etc.) from the cash reserves and if the company is doing well to recover debtor balances and make cash sales.
Cash is obviously very important and making sales is just one part of the equation. Turning these sales into cash and being able to recover what is owned to you is another!