The pharmaceutical industry discovers, develops, produces, and markets drugs to treat diseases, alleviate symptoms, or vaccinate patients. It can be classified into drug discovery and manufacturing units that include active pharmaceutical ingredients, generics, and biologics. The success of pharmaceutical companies depends on continuous drug discovery efforts through various steps like target selection, lead discovery, medicinal chemistry, and clinical trials. Manufacturing involves production of active pharmaceutical ingredients and formulations like tablets, syrups, capsules, and injectables. Quality control and quality assurance ensure safety and efficacy at each stage of the process.