Final answer:
Pathology is the study of disease and the changes in body tissues and organs it causes, differing from epidemiology, which examines disease distribution in populations.
Step-by-step explanation:
Pathology is the study of disease, especially the structural and functional changes associated with disease. Unlike epidemiology, which is the study of the occurrence, distribution, and determinants of health and disease in a population, pathology focuses on the changes within the body's tissues and organs that arise as a result of disease. These changes can include everything from cellular abnormalities seen under a microscope to major structural abnormalities that affect the function of an organ or system.