Financial statements provide essential information about a company's financial performance and position over a period of time. The key financial statements are the income statement, balance sheet, statement of cash flows, and statement of retained earnings. Ratio analysis is used to evaluate a company's liquidity, asset management, debt management, and profitability by calculating financial ratios and comparing them over time and to other companies. While financial statement analysis provides useful insights, results must be interpreted carefully due to limitations such as differences in accounting treatments between companies.