Stellar composition refers to the elements and materials that make up a star. Most stars, including our Sun, are primarily composed of hydrogen and helium, which account for about 98% of their mass. Other elements, such as carbon, oxygen, and nitrogen, are present in smaller amounts and play a crucial role in the star's life cycle and evolution. The study of stellar composition helps astronomers understand the formation and development of stars. By analyzing the light emitted from a star, scientists can determine its chemical makeup using a technique called spectroscopy. This information provides insights into the star's age, temperature, and potential for hosting planetary systems like Earth.