Network traffic generators emulate real-world network and application traffic and inject it across websites and networks to stress test the network and measure performance metrics like load times, download rates, jitter, packet loss, and delay. These tools are essential for measuring network services, QoS, and user experience. Typically, network traffic generators are used to test large-scale network deployments. Sometimes referred to as network assessment, common use cases include measuring service quality across distributed, hybrid networks and validating large-scale deployments like SD-WAN before going live.