Agriculture uses a large amount of water, so sustainable water management is vital for farming. Smart irrigation systems using IoT help deliver water only when and where it is needed. Soil moisture sensors, drip irrigation, and automated pumps save water and energy. Farmers can track usage and plan better with real-time data. These practices improve crop yield while conserving water. Sustainable water use also protects groundwater levels and reduces pollution from runoff. It ensures farming remains productive for future generations.