"Evolution and Death of Massive Stars"

First I will review the evolution of massive stars, their burning stages and nucleosynthesis. Then I will give an overview how their evolution changes as a function of initial stellar mass and how it depends on the initial metallicity. Here I will focus on two extreme cases: present-day stars with composition like our sun, and primordial stars that form from the composition left by the big bang -- the first stars to form in the universe. Finally, I will give an overview on the final fate of massive single stars: the type of explosion they make and what kind of remnants they leave, both as a function of mass and metallicity.