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Shift-left testing refers to the practice of integrating testing earlier in the software development process. This concept emphasizes the importance of quality assurance throughout the lifecycle of development rather than relegating it to the end stage. By moving testing activities to the left on the project timeline, teams can identify defects sooner, enhance collaboration between developers and testers, and ultimately deliver higher-quality products faster.

This approach allows for immediate feedback loops, which helps in identifying potential issues before they progress further into the development process, reducing the costs and time associated with fixing defects later on. Testing becomes an integral part of the development workflow and is aligned with Agile and DevOps methodologies, promoting continuous integration and continuous delivery.

On the other hand, alternatives like testing only after deployment or delaying testing until user feedback is received do not align with the principles of shift-left testing, which seeks to foster early and ongoing testing practices.