Sean Kemery is a former commodities portfolio manager at Deutsche Bank AG, discussing the benefits of commodities for investment, such as inflation protection and price movement discrepancies compared to stocks. Commodities are divided into four categories: energy (e.g., oil, natural gas), metals (e.g., gold, silver), agriculture (e.g., corn, wheat), and livestock (e.g., poultry, cattle). Each category presents unique characteristics and investment dynamics influenced by factors like market volatility and weather conditions.