Modern web applications are vital for businesses, making their security a top priority. Dynamic Application Security Testing (DAST) is crucial because it detects runtime vulnerabilities that static analysis misses. GitLab's DAST provides automated security testing within the CI/CD pipeline, integrating seamlessly into workflows. DAST identifies flaws like authentication issues, input validation problems, and API vulnerabilities. It complements other testing methods, offering a black-box perspective of real-world attack scenarios. Integrating DAST early, using a "shift-left" approach, reduces costs and speeds up development cycles. It aids in meeting compliance requirements and improving risk management. Setting up DAST involves GitLab's Ultimate subscription and application accessibility. Basic implementation requires including a DAST template in the .gitlab-ci.yml file. DAST uses passive and active scans, with active scans requiring careful implementation. Authentication configuration is essential for complete security coverage, enabling testing of user-specific features. The results of the DAST scans are displayed in the merge requests providing vulnerability details, location information, technical context, and remediation guidance.