Pharmacognosy is the study of natural products, especially plants, and their use as medicines. Synonyms for pharmacognosy include natural product chemistry and herbal medicine. Natural product chemistry focuses on the chemical compounds found in natural sources such as plants, fungi, and microorganisms. Herbal medicine is the use of plants, plant extracts, and plant-derived products for medicinal purposes. Ethnobotany is another synonym for pharmacognosy, which involves the study of the interactions between people and plants, particularly in traditional healing systems. Plant biochemistry is also a synonym for pharmacognosy, which entails investigating the biochemical processes occurring in plants and their medicinal properties.