Gross profit margin is a term commonly used in business and finance to measure the profitability of a company. It refers to the difference between revenue and the cost of goods sold, expressed as a percentage. This metric is an important one as it helps investors and analysts to evaluate a company's financial health. Other terms that can be used interchangeably with gross profit margin include gross margin, gross profit ratio, and gross income margin. Regardless of what term is used, they all measure the same aspect of a business's financial performance and can provide valuable insights for decision-making.