Energy obtained from natural sources witch are inexsotible, because of the great amount of energy they contain and because they can be regenerated by natural ways.
It is obtained directly from the sun. The solar radiation can be used (and take advantage of it) for it’s capacity to heat.
It’s a kind of energy renewable and clear, it’s know as green energy.
Reception of solar radiation can be used to:
Transform solar energy in heat and is thermal energy.
To create/generate electricity is a photovoltaic.
It’s a way of obtaining energy trough photovoltaic panel.