Mice are small rodents commonly used in scientific research due to their biological similarities to humans, rapid reproductive rate, and relatively low cost. They are used in a wide range of research areas, including genetics, neuroscience, immunology, and cancer research. Mice are often genetically modified to mimic human diseases, making them a valuable tool for studying disease mechanisms, developing treatments, and testing new therapies. Researchers use mice to study various aspects of biology, behavior, and genetics, providing insights into human health and disease.