This document discusses ratio analysis and its uses. Ratio analysis involves calculating and interpreting various financial ratios to evaluate aspects of a company's performance like profitability, liquidity, efficiency, and financial stability. The document outlines different types of ratios including profitability ratios like gross profit margin, net profit margin and return on assets. It also discusses liquidity ratios like current ratio and quick ratio. Finally, it covers finance structure ratios such as debt-equity ratio and debt ratio that measure a company's use of leverage. Specific examples and interpretations of these ratios are provided for a sample company over several years.