The technology mainly responsible for improving network efficiency is Quality of Service (QoS). QoS refers to a set of technologies and techniques that prioritize network traffic, ensuring that critical applications receive the bandwidth and latency they require for optimal performance. By regulating packet flow and managing congestion, QoS enhances user experience, particularly in applications like voice over IP and video conferencing, where timing is crucial. Networks equipped with QoS capabilities can better allocate resources, enforce policies, and improve overall service quality for users.