Application security testing is an essential process for identifying and mitigating vulnerabilities in software applications, thereby safeguarding them from potential cyber threats. With the increasing complexity of cloud computing and mobile technologies, attackers find more opportunities to exploit vulnerabilities, making regular and early testing crucial. Key benefits include the prevention of data breaches, compliance with regulatory requirements, and the protection of organizational reputation. Various testing methods such as penetration testing, vulnerability scanning, and code review are employed to identify security flaws. Automated tools like Static Application Security Testing (SAST) and Dynamic Application Security Testing (DAST) enhance the efficiency of these processes. The future of application security testing is shaped by trends such as AI and machine learning, increased focus on mobile and IoT devices, automated vulnerability remediation, and the integration of security practices into the software development lifecycle through approaches like DevSecOps. Harness Security Testing Orchestration offers a solution to streamline testing, ensuring compliance while maintaining development velocity.