DevSecOps is an approach that integrates security practices throughout the software development lifecycle, emphasizing collaboration among development, security, and operations teams to build secure applications from the outset. This approach involves "shifting security left," meaning security practices are integrated early in the development process, which helps in identifying and resolving vulnerabilities sooner and meeting regulatory requirements more efficiently. Core principles include making security a shared responsibility across the organization, breaking down functional silos, and enhancing collaboration, all of which contribute to driving better decision-making and optimizing tooling for developer productivity. The DevSecOps toolkit includes CI/CD pipelines, application security scanners, and policy-as-code governance, with AI and automation playing crucial roles. Tools such as Software Composition Analysis, Static and Dynamic Application Security Testing, and Infrastructure-as-Code scanning are employed to manage vulnerabilities effectively. Successful implementation of DevSecOps can lead to a decrease in application security incidents, compliance audit time, and vulnerabilities in production, while increasing deployment frequency and reducing lead time for addressing zero-day vulnerabilities, ultimately aiming for a balance between security and developer velocity.