Non-GBR (Non-Guaranteed Bit Rate): Non-GBR is a QoS service level where the bit rate is not guaranteed. The application receives whatever bandwidth is available after GBR services are allocated.
Analogy: Think of sharing a Wi-Fi network with many users. Your internet speed can fluctuate depending on the overall network traffic.
Why It Matters: Non-GBR is suitable for applications that can tolerate some degree of latency and jitter, like web browsing or email.