Type M refers to a classification of certain types of stars that are characterized by their cool temperatures and reddish appearance. These stars have surface temperatures below 3,500 Kelvin and are the most common type in the universe. They are often referred to as red dwarfs and can burn for billions of years, making them stable and long-lived. In addition to their longevity, Type M stars are important for the search for extraterrestrial life. Their habitable zones, where conditions might allow for liquid water, are much closer to the star compared to hotter stars. This proximity can lead to interesting planetary dynamics, such as tidal locking, where a planet always shows the same face to its star.