M Dwarfs, also known as red dwarfs, are the smallest and coolest type of main-sequence stars. They have a mass between 0.08 and 0.6 times that of the Sun, making them much less luminous. Due to their low temperature, they emit most of their light in the infrared spectrum, which makes them difficult to observe with the naked eye. These stars are the most common in the universe, accounting for about 70-80% of all stars. M Dwarfs have long lifespans, often lasting tens of billions of years, and they can host planetary systems, making them of great interest in the search for extraterrestrial life, particularly in relation to exoplanets.