An IoT based smart energy management system leverages Internet of Things (IoT) technology to monitor, control, and optimize energy usage across various applications, including homes, industries, and commercial spaces. It integrates smart sensors, meters, and devices to provide real-time data on energy consumption and facilitates automated adjustments to enhance efficiency. These systems support remote monitoring via apps or dashboards, allowing users to track energy patterns and identify areas for improvement. They also promote sustainability by reducing energy wastage and incorporating renewable energy sources. With predictive analytics and intelligent automation, IoT-Based Energy Management Systems help reduce costs and environmental impact, making energy management smarter and more sustainable.