Most stars, including our Sun, are primarily composed of hydrogen and helium.

Here's a breakdown:

* Hydrogen (H): Makes up about 70-75% of a star's mass.

* Helium (He): Makes up about 24-28% of a star's mass.

While these two elements dominate, stars can contain trace amounts of other elements, like oxygen, carbon, nitrogen, and iron, collectively known as "metals" in astronomy.