The predominant element in the Sun is hydrogen. Comprising about 74% of its mass, hydrogen undergoes nuclear fusion in the Sun's core, converting into helium and releasing tremendous energy in the form of light and heat. This process is essential for the Sun's functionality, providing energy that sustains life on Earth. Helium makes up about 24% of the Sun's mass, while other elements, such as oxygen, carbon, and nitrogen, account for the remaining 2%. The Sun's composition and energy production are crucial to understanding stellar evolution and the dynamics of our solar system.