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In a network that has time-sensitive traffic (VoIP) or bandwidth-intensive traffic (real-time or near-real-time streaming-video), QoS makes it possible for you to prioritize the time-sensitive traffic and assign larger amounts of bandwidth to those applications that require it.
VoIP traffic has relatively low bandwidth requirements, but cannot tolerate latency or frame loss. Therefore, this traffic needs a high priority to ensure its timely delivery. On the other hand, streaming video is bandwidth-intensive but has large "jitter buffers" so can tolerate some latency. Thus, you can assign streaming video traffic a lower priority than voice, but must assign streaming video more bandwidth than voice.
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