Merck & Co., Inc. is a global healthcare company focused on discovering, developing, manufacturing, and commercializing prescription medicines, vaccines, biologic therapies, and animal health products. Its pharmaceutical business serves major therapeutic areas including oncology, infectious diseases, immunology, cardiometabolic disorders, and hospital acute care, while its vaccines portfolio addresses prevention across pediatric, adolescent, and adult populations. The animal health segment provides veterinary medicines, vaccines, and health management solutions for livestock and companion animals. Merck & Co., Inc. works with hospitals, physicians, pharmacies, governments, wholesalers, and veterinary customers across global markets. Headquartered in Rahway, New Jersey, and founded in 1891, the company is a major biopharmaceutical participant in both human and animal health markets.