This illustration summarizes the main features inside the Sun. In its centre energy is released by nuclear fusion. Further out the energy travels through the radiative zone and further out still energy is transported by convection . The energy then reaches the surface and escapes to produce the light and heat we see and feel.
You can find out more about the inside of the Sun by diving beneath the solar surface.
To learn more about the way in which energy is produced and changed in the Sun, check out Jack's explanation of the Sun's energy in our 'Solar Energy chain' section.