Hydroponics is simply the production of crops without soil.
Hydroponics is also an answer to two of the world’s growing concerns: diminishing soil quality, and water scarcity.

As those concerns grow, so does the world’s interest in hydroponics, as a soil-less, water-conserving, and high-density production technique.
Also, food safety concerns attached to traditional agriculture, such as high pesticide use and metal contaminants in the soil, are significantly more manageable if not entirely erased in a hydroponics production system.

source : brightagrotech.com