Red dwarfs are small, cool stars that are the most common type in the universe. They have a mass between 0.08 and 0.6 times that of the Sun and are classified as M-type stars. Due to their low temperature and brightness, red dwarfs burn their fuel slowly, allowing them to live for billions of years. These stars are often found in binary systems and can host exoplanets in their habitable zones. While they are dim and not easily visible to the naked eye, red dwarfs are important for studying stellar evolution and the potential for life beyond our solar system.