Why do production servers and test servers have to be similar?

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Why do production servers and test servers have to be similar?

 Test environment has to be closely matched with the production environment so when testers replicate the same environment as users, they are able to detect as many issues as possible the users would face that affects performance and functions of the application, so these issues are resolved before it is released to the user, so the latter is able to use a bug free application that runs smoothly without any issues.

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