It is a method of Cultivation of Plants without using soil, the nutrient which is obtained from soil need to provide in the form of inert growing media, supplied with nutrient-rich solution, water, oxygen, and sunlight.
So nutrient-rich and water-based mineral solutions, Special liquid fertilizers are fed to hydroponic plants.
Here plants get all their nutrients from the roots which are dissolved in nutrient-rich water.
Examples of Hydroponic plants: Lettuce, Green Beans, tomato, cucumbers, etc.