Parasitology is the branch of biology that focuses on the study of parasites, organisms that live on or inside other organisms (hosts) and feed off them. This field examines the classification, life cycles, distribution, and interactions of parasites with their hosts. Parasitologists seek to understand how parasites evolve, adapt, and impact the health and behavior of their hosts. Research in parasitology plays a crucial role in public health, agriculture, and conservation efforts. It also helps in the development of treatments and prevention strategies for parasitic infections in humans and animals.