Testing how well a system performs under expected user load. Like seeing how many people can fit in an elevator before it becomes uncomfortable.
Before Black Friday, e-commerce sites do load testing to ensure their websites can handle millions of shoppers.
Azure Load Testing is a managed service for running JMeter-based load tests. AWS Distributed Load Testing is an AWS Solutions Implementation that deploys a distributed load-testing framework on AWS (not a single standalone managed product). Google Cloud Test Lab focuses on testing mobile apps on real/virtual devices and is not a general-purpose web/API load-testing service; on GCP, load testing is commonly done with third-party tools (e.g., JMeter, k6, Locust) running on Compute Engine/GKE/Cloud Run. OCI Load Balancer is for distributing production traffic, not generating test load; OCI load testing is typically done with third-party tools running on OCI compute.