The National Library of Medicine defines biomedical research as "research that is conducted to increase fundamental knowledge and understanding of the physical, chemical and functional mechanisms of human life processes and disease.
Basic research also known as fundamental or pure research is driven by a scientist’s curiosity or interest in a question. The main motivation of this type of research is to expand man’s knowledge of the world and not to invent or create something new. This area of research includes observation, description, measurement, and experimentation in order to better understand how living things work. Basic research forms the foundation of applied and clinical research.
Applied research is designed to address specific problems, rather than to just acquire knowledge or increase understanding. Applied research includes development of new drugs or procedures and can involve animals, humans, tissue cultures, or computer models.
Clinical research involves the study of human subjects to develop new diagnostic and therapeutic approaches that improve human health.
Source: Sage Research Methods