This introduction to hydroponics will provide an overview of the basics of hydroponic gardening. We will discuss the different types of hydroponic systems, the benefits of hydroponic gardening, and the necessary supplies and equipment needed to get started. We will also cover the
From Wikipedia
Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions in an artificial environment. Terrestrial or aquatic plants may grow freely with their roots exposed to the nutritious liquid or the roots may be mechanically supported by an inert medium such as perlite, gravel, or other substrates.