Merck & Co., Inc., based in Rahway, New Jersey, is a global healthcare company that operates through two main segments: Pharmaceutical and Animal Health. The Pharmaceutical segment focuses on human health products, including treatments for oncology, acute care, immunology, neuroscience, virology, cardiovascular diseases, and diabetes, as well as vaccines for various age groups. The Animal Health segment develops and markets veterinary pharmaceuticals and vaccines. Merck's mission is to discover, develop, and provide innovative products and services that save and improve lives around the world.

Notable figures associated with Merck include Friedrich Jacob Merck, the founder, and key leaders such as Belén Garijo. The company has achieved significant milestones in medical research and development, contributing to advancements in both human and animal health. Merck's impact is evident in its extensive portfolio of life-saving medications and vaccines, which have made substantial contributions to global health. The company continues to be a leader in the pharmaceutical industry, driven by its commitment to innovation and excellence.