Testing strategies are systematic approaches used to evaluate the quality and performance of software applications. They help identify defects, ensure functionality, and improve user experience. Common strategies include unit testing, integration testing, and system testing, each focusing on different aspects of the software. Effective testing strategies also involve planning and prioritizing tests based on risk and impact. Techniques like automated testing and manual testing can be employed to streamline the process. By implementing these strategies, teams can enhance software reliability and reduce the likelihood of issues in production environments.