What causes the the change color of a star?

The color of a star is primarily determined by its surface temperature, which affects the wavelength of light it emits. Hotter stars emit more blue and white light, while cooler stars emit red and orange light. Additionally, factors like chemical composition and age can influence a star's color, as they impact the star's temperature and luminosity over its lifecycle. As stars evolve, they may change color, reflecting their varying temperatures and stages of development.