This document defines and provides examples of key financial ratios. It identifies the top 5 ratios as: current ratio, return on investment, equity ratio, dividend yield, and debt to equity ratio. The document explains each ratio's calculation formula. It also calculates ratios like return on investment for Siemens using the company's 2014-2013 financial statements to demonstrate the ratios in practice. Financial ratios are grouped into profitability, liquidity, solvency, and efficiency categories.