This document discusses ratio analysis, which refers to analyzing financial statements using accounting ratios. Ratios show quantitative relationships between accounting items and can be expressed as proportions, rates, or percentages. Ratio analysis is useful for evaluating trends, performance, efficiencies, and more. It allows for comparison of a company's performance over time and against other firms. While useful, ratio analysis has some limitations like not capturing a full picture on its own and being impacted by accounting policies. The document outlines various ways of classifying and calculating ratios from financial statements.