Recommended answer:
You should talk briefly about types of plagiarism such as intentional and unintentional plagiarism and describe causes of plagiarism. You can get useful tips about plagiarism here.
You can tell that you use anti-plagiarism scanners such as Viper, Turnitin, or other plagiarism detectors. Before you say this you should know the basic features and application principles of at least one commonly used plagiarism detector.Perhaps you could mention the one that is most often used - the plagiarism detector that is called PlagiarismChecker.
To learn more about various plagiarism detectors, their advantages and shortcomings, click here...
You will find more ESL job interview questions with provided answers here...