K Stars are a type of star classified by their spectral characteristics. They have a surface temperature ranging from about 3,900 to 5,200 degrees Celsius. K Stars are known for their orange hue, which is a result of their cooler temperatures compared to other stars like G Stars and M Stars. These stars are often found in the main sequence phase of their life cycle, where they fuse hydrogen into helium. K Stars can be important for studying stellar evolution and the potential for exoplanets in their habitable zones, making them of interest to astronomers and astrophysicists.