Sub-second latency describes live video delivery where the total delay from camera capture to viewer display is under one second. Achieving sub-second latency requires an optimized combination of efficient encoding, low-latency transport protocols such as WebRTC or SRT, minimal buffering, and fast decoding at the receiver. For operational live streaming where commanders must make real-time decisions based on what field personnel are seeing, sub-second latency is the performance benchmark that separates operational-grade systems from broadcast-grade ones.