What process causes all stars to glow and produce energy

The simple answer is that deep inside the core of the Sun, enough protons can collide into each other with enough speed that they stick together to form a helium nucleus and generate a tremendous amount of energy at the same time. This process is called nuclear fusion.

Explanation:stars shine Because they are extremely hot (like fire gives off light because it is hot).

The source of this energy is present deep inside the star where the nuclear reactions are taking place.

In most of the stars the hydrogen is being converted into helium, a process which gives off energy that heats the star