What is a massive ball of plasma that shines because of thermonuclear fusion in its core?

A massive ball of plasma that shines due to thermonuclear fusion in its core is called a star. In stars, hydrogen atoms fuse to form helium, releasing immense amounts of energy in the process, which produces light and heat. This fusion process occurs under extreme pressure and temperature conditions in the star's core. Our Sun is a prime example of such a star.