1. Core: This is the innermost layer, where nuclear fusion takes place. It's incredibly hot and dense, and it's responsible for generating the Sun's energy.

2. Radiative Zone: This layer surrounds the core and energy from the core travels outwards as electromagnetic radiation. It takes millions of years for the energy to pass through this zone.

3. Convective Zone: This is the outermost layer of the Sun's interior. Here, energy is transferred through convection, meaning that hot gas rises and cooler gas sinks. This creates a pattern of swirling, boiling gas that can be seen as granulation on the surface of the Sun.

It's important to note that these are just the layers within the Sun's interior. The Sun also has an atmosphere with several layers of its own, including the photosphere, chromosphere, and corona.