Energy-efficient networking is a research area and engineering discipline focused on minimizing the energy consumption of communication networks. It investigates strategies and technologies to reduce power usage across network components, protocols, and architectures. This field examines methodologies for optimizing energy usage through techniques like dynamic resource allocation, sleep modes, and intelligent traffic management, often balancing energy savings with performance requirements such as latency and throughput. Its significance stems from its crucial role in enhancing environmental sustainability, reducing operational expenditures, and extending device autonomy in the face of escalating global network traffic and infrastructure growth.