Thanks for your question. Before I answer your question, I believe solar is new to you and you take our introductory course in renewable energy.
First of all, solar energy is the energy from the sun. Of course you now know how important this energy from the sun is to not just is not to our planet. Solar is the chief source of energy. Plants through photosynthesis use solar energy to produce food that we eat.
 
Solar is also used for drying of our clothes and any material. This is an ancient use of solar energy.
 
Solar energy can also be used to preserve our foods.
 
Now solar energy can be converted directly into electricity. This is our primary focus. Using solar panels, you can harvest this energy from the sun and convert it to electricity.
 
Hope the helps.