Once a star is fully formed it becomes what type of star?

Once a star is fully formed, it typically becomes a main sequence star. During this stage, it fuses hydrogen into helium in its core, producing energy that allows it to shine steadily for billions of years. The exact characteristics of the main sequence star, such as its size and temperature, depend on its initial mass. After exhausting its hydrogen fuel, the star will evolve into later stages, such as a red giant or supergiant, depending on its mass.