SecDevOps (also known as DevSecOps and DevOpsSec) is a procedure that involves integrating secure development practices and methodologies into development and deployment processes that enforces DevOps.
Steve Arychuk at New Relic describes it well:
SecDevOps — sometimes called “Rugged DevOps” or “security at speed” — as a set of best practices designed to help organizations implant secure coding deep in the heart of their DevOps development and deployment processes. …It seeks to embed security inside the development process as deeply as DevOps has done with operations.
