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Frequent software updates are a part of the IT landscape. When you upgrade software to a new version, there's always a chance that a previously working function will break. This phenomenon is called a regression. Regression testing is designed to identify these regressions so that you can decide whether or not to update.

There was a time when organizations would postpone software updates because they would routinely break things and create troubleshooting headaches for everyone. Although this isn't as much of a problem anymore, it does happen from time to time, so it's important to perform regression testing in a controlled test environment prior to rolling out major software updates.