Hi steemian friend, welcome to 
Hydroponics is the cultivation of planting by using water without using soil with emphasis on the fulfillment of nutritional needs for plants. The water requirement on hydroponics is less than the water requirement on cultivation with soil. Hydroponics use water more efficiently, so it is suitable to apply to areas with limited water supply.
As the times progressed, agricultural experts continued to develop agricultural technology. As in urban areas where land is narrow to plant or grow crops, therefore hydroponic techniques are developed to cope with the narrowness of urban farmland.
Inert planting media is a planting medium that does not provide nutrients. Inert media generally inert function as a buffer and buffer plants. Some examples include: Charcoal husk, Sponge, Expanded clay, Rockwool, Coir (Coir), Perlite, Pumice, Vermiculite, Sand, Gravel, Wood powder or called sawdust
This is a convenience for urban people who like to grow vegetables without having to eat a large area of land. You can also plant flowers and other types of plants that you want.
Good luck steemian friend ...
