Ensuring the security of software applications is crucial to protect sensitive data and maintain customer trust, while complying with regulatory requirements. Interactive Application Security Testing (IAST) combines static and dynamic analysis techniques to provide real-time vulnerability detection and response, allowing for early identification of security issues in development stages. IAST is interactive because it runs security tests alongside existing manual and automated tests, providing low overhead and continuous security monitoring throughout the software development lifecycle. This approach offers several benefits, including highly accurate results, fast real-time testing, and reduced overhead, making it an effective tool for detecting security vulnerabilities, simulating real-world security scenarios, finetuning security controls, ensuring compliance with standards and regulations, supporting risk management strategies, enhancing CI/CD pipelines, and promoting DevSecOps practices. To get the most out of IAST, it's essential to follow best practices, such as determining the scope of implementation, integrating it throughout the software development lifecycle, and creating a culture of accountability around security among all engineering teams. With tools like New Relic Vulnerability Management, IAST can be easily integrated into existing workflows, providing automated security testing and guided remediation to fix vulnerabilities quickly and efficiently.