Virtual User or Virtual Tester

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VU

A user simulated by an automated testing tool.

Performance tests are run with virtual users. A virtual user is a simulation of a real user conducting transactions on an application. During a performance test, many virtual users can be run from one computer.

Load tests run a number of virtual users. A virtual user is a program that acts just like a real user would in making requests to a Web application. During a load test, a considerable number of virtual users can be run on one computer, in this context called a driver machine.