Merck & Co. is a global healthcare company based in the United States, known for its research and development of pharmaceuticals, vaccines, and animal health products. Founded in 1891, it has a long history of innovation in treating various diseases, including cancer, diabetes, and infectious diseases. The company operates in more than 140 countries and is recognized for its commitment to improving health outcomes worldwide. The company is also involved in various partnerships and collaborations to advance medical research. Merck & Co. is known for its flagship products, such as Keytruda, a cancer immunotherapy, and Gardasil, a vaccine for human papillomavirus (HPV). Through its efforts, Merck aims to address unmet medical needs and enhance global health.