As cybersecurity threats become increasingly frequent, relying solely on one type of software testing leaves applications susceptible to attacks, highlighting the importance of both static application security testing (SAST) and dynamic application security testing (DAST). SAST analyzes code at rest early in the development lifecycle to identify vulnerabilities such as SQL injection and buffer overflows, while DAST simulates attacks on live applications to uncover vulnerabilities visible only during execution. These methods, when combined, provide a comprehensive security testing approach that covers both pre-deployment code analysis and post-deployment vulnerability assessment. Integrating SAST and DAST into continuous integration and continuous deployment (CI/CD) pipelines enhances software security without compromising productivity by automating tests that ensure compliance with security standards. Other methodologies like interactive application security testing (IAST), runtime application self-protection (RASP), and hybrid application security testing (HAST) also contribute to a robust security strategy, with each offering unique advantages. The adoption of these testing practices helps mitigate security incidents, as they enable the detection and resolution of vulnerabilities throughout the software development process.