An M-Type Main Sequence Star is a type of star that falls within the spectral classification of M, which is the coolest and least massive category of main sequence stars. These stars have surface temperatures ranging from about 2,400 to 3,700 Kelvin and are often red in color. They are the most common type of star in the universe, making up about 70% of all stars. M-Type stars are known for their long lifespans, often lasting tens of billions of years. Due to their low mass, they burn their hydrogen fuel slowly, allowing them to remain stable for extended periods. Examples of M-Type stars include Proxima Centauri and Barnard's Star, both of which are located in our Milky Way Galaxy.