A virologist is a scientist who specializes in the study of viruses, which are tiny infectious agents that can only replicate inside the living cells of organisms. They investigate how viruses function, how they spread, and how they affect their hosts, including humans, animals, and plants. This research is crucial for developing vaccines and treatments to combat viral infections. Virologists often work in laboratories, using advanced techniques to analyze viral structures and behaviors. They may collaborate with other scientists, such as immunologists and epidemiologists, to understand the broader impact of viruses on public health and to devise strategies for controlling outbreaks.