Ethnobotany is the study of how people use plants for things like food, medicine, and materials for decorating. It looks at plants and how they are used around the world by different cultures. People who study ethnobotany want to understand why certain plants are used in certain ways. For example, why do some people use roses for decoration while other people use jasmine flowers for medicine? By understanding how plants are used, people can help preserve different cultures and the plants they use.