Which are the most common hydroponic nutrients used for growing?

In hydroponics, plants do not grow in soil. Instead, the plants are grown in a water-based medium or other growing mediums like coir, rockwool, etc.

All plants need the same conditions to grow i.e. sufficient amount of light, water, and materials to make their own food. For plants growing in soil, food is obtained by uptake in nutrients from the soil. Since soil is absent in hydroponics, food needs to be provided to the plant using a different route. This is where hydroponic nutrients come in.