Okay, so to answer this question, we could picture the sun in our minds, and considering that it, like the Earth, has layers made up of different compositions and structures.
The inner layer we have in the sun is that what you mentioned, the core, which is conformed of actually two parts: the inner core, and the radiative zone.
After this, the next layer's the convection zone, and the surface flows.
The next layers are the photosphere, chromosphere, and finally, on the surface, the corona.