Liquidity ratios measure a company's ability to pay short-term debts. They include the current ratio, acid test ratio, and cash ratio. The current ratio compares current assets to current liabilities. The acid test ratio is similar but excludes inventories since they may not convert to cash quickly. The cash ratio considers only the most liquid assets like cash and marketable securities compared to current liabilities. These ratios are used to analyze a company's short-term financial health and liquidity.