Hydroponics

Honestly, I never heard about hydroponic systems until recently. My knowledge about planting vegetables, fruits or trees are very limited. The farms I know are those traditional farmers who plant crops in the soil. I just learn recently that people can grow plants using mineral nutrient solutions, in water, without soil it is called Hydroponics. Where soil is no require. Oh noh.. where did I go when my professor teach us about that? I can't recall! he he