1. Development Environment - All the developers check in their current work into development environment. 2. QA (Quality Assurance) Environment - This is the environment, where testers (QA) test the application. QA cannot test on development environment, because developers are continuously checking in new code. So, if there is a bug, we don't know, if it's caused by the old or new code. In short, if development is going on in the same environment it would be difficult to keep up with the current state. There will be lot of confusion, if the developer is trying to fix in the same area as the tester is testing. Without development and QA environment being seperate their is no way to do proper testing.
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