What Qa Server Stand for?

I know this is an old post, but I found this while searching so I thought I'd add in some of my own knowledge in case other people come here wanting more information.

Michel got most of it right, but I'd like to correct a few things, if I may. Firstly, a QA Server usually refers to a machine that handles the QA process, and runs software that helps create environments that can test different code branches, as part of the QA process. This can range from switching environments and checking out a branch, to rebuilding entire machines that match production environments and deploying code to them. The basic principle of a QA Server is to help create QA environments for testing.

Staging/Pre-Production environments usually refer to one or multiple environments that match, as closely as possible, the production environment that the code will be deployed to. Again, this could be as simple as a machine with software installations that match the production machine's versions, to a mini web server farm where multiple machines and databases are connected together in a way that matches the production environment. The goal, again, is to have a place that matches production, but is not production, and again, for the purposes of testing and Quality Assurance.

I hope that helps anyone that is still unsure of the original questions answered.

There exists no such clear differentiation between staging/production environment. QA Server environment is a platform, where application is deployed for testing purposes, executing functional, security and performance test cases.

Staging is an environment where application is deployed (again for testing purposes) but its maintained that it matches with production environment as much as possible in terms of OS and specifications.