Stellar processes refer to the various physical and chemical reactions that occur within stars throughout their life cycles. These processes include nuclear fusion, where hydrogen atoms combine to form helium, releasing vast amounts of energy. This energy is what makes stars shine and provides the heat and light necessary for life on planets like Earth. As stars evolve, they undergo different stages, such as the main sequence, red giant, and supernova phases. During these stages, elements are created and released into space, contributing to the formation of new stars and planets. This cycle of birth, life, and death is essential for the enrichment of the universe with elements like carbon and oxygen, which are vital for life.