Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Pohang Iron and Steel Company, or POSCO (KRX: 005490) (NYSE: PKX) (TYO: 5412) (LSE: PIDD), based in Pohang, South Korea, is the world's third-largest steel maker by market value and Asia’s most profitable steelmaker.Currently, POSCO operates two steel mills in the country, one in Pohang and the other in Gwangyang. In addition, POSCO operates a joint venture with U.S. Steel, USS-POSCO, which is located in Pittsburg, California.With the strong Korean shipbuilding and automobile industry dependent on POSCO for steel, it has been seen as the bedrock of Korea's industrial development over the past 40 years.