How does QoS improve voice traffic quality?

QoS improves voice traffic quality primarily by reducing packet loss. Voice communication is highly sensitive to lost packets, which can cause breaks in conversation, garbled audio, and a generally poor user experience. QoS mechanisms prioritize voice packets over less time-sensitive data, ensuring they are delivered reliably and promptly, even during network congestion. Reducing bandwidth usage is not a direct QoS function for improving quality; QoS manages existing bandwidth. Differentiating voice and video traffic is a part of QoS, but the ultimate goal for voice is to ensure its reliable delivery, which means minimizing loss. Increasing jitter would degrade voice quality, not improve it.