Hydroponics is an innovative method of growing plants without soil, using nutrient-rich water instead. In this system, plants are supported by inert media, such as rock wool or clay pellets, and their roots are submerged in a solution that delivers essential nutrients directly. This technique allows for greater control over growing conditions, leading to faster growth rates and higher yields. Hydroponics is often used in controlled environments like greenhouses, making it a popular choice for urban agriculture.