Hydroponics is simply growing without soil. The roots need water, nutrients and oxygen, all of which can be provided in a more efficient way than in soil. Botanium's porous growing medium absorbs a lot of water, while also providing an aerated environment for the roots.
The benefit of this is not only quicker growth and more control, but it is also a simpler approach to growing.
The included nutrients are easily added with a pipette and the amount you need to add depends on the plants you are growing.