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What is energy solar power?

May be it sound foolish to you but I need to know what is solar power energy? And how efficient it is? It’s not that I don’t know anything about energy solar power. I know that it is renewable source of energy and we all must switch to it so that we can save other energy sources. Here I am expecting for expert advice that what is energy solar power. I hope someone will tell me more about it that I don’t know.