A smart irrigation system using IoT uses connected sensors and controllers to water crops automatically. It collects real-time data on soil moisture, weather, and temperature. Based on this data, the system turns on or off the water supply when needed. This helps avoid overwatering and saves a lot of water. Farmers don’t need to guess when to irrigate—they get accurate, automatic help. It reduces water waste, saves time, and boosts crop yield. IoT turns old irrigation methods into smart, data-driven systems.