DevSecOps refers to a software engineering culture that introduces security early in the development lifecycle to mitigate risks. It emphasizes collaboration between developers and security teams, where they previously worked independently. DevSecOps combines these teams to strengthen security testing without disrupting the development cycle. There is a need for DevSecOps because security and compliance are now major priorities, and developers can inadvertently release software with vulnerabilities. Key principles include integrating security practices into development, continuous learning, collaboration between teams, sharing threat intelligence, and delivering secure software quickly.