The Center for Drug Evaluation and Research (CDER) is responsible for protecting and promoting public health by ensuring the safety and effectiveness of human drugs. CDER oversees new drug development and reviews marketing applications, monitors drug safety after approval, and ensures quality in manufacturing. CDER's mission is to ensure that drugs are safe and effective for their intended use through activities like reviewing new drug applications, communicating drug information to health professionals and consumers, and facilitating innovation in drug development.