DevOps is an offshoot of agile software development, formed by the requirement to keep up with the higher software velocity and throughput obtained by agile approaches. Over the last decade, advances in agile culture and methodology have revealed the need for a more comprehensive approach to the end-to-end software delivery lifecycle.

What is agile software development?

Agile development is a catch-all phrase for a variety of iterative and incremental software development approaches. Scrum, Kanban, Scaled Agile Framework® (SAFe®), lean development, and extreme programming are some of the most popular agile approaches (XP).

While each agile methodology is distinct in its approach, they all share a shared vision and basic ideals (see the Agile Manifesto). They all rely on iteration and the ongoing input that it delivers to incrementally enhance and deliver a software system. They all require continuous planning, continuous testing, continuous integration, and other types of project and software evolution. They are all lightweight and versatile, especially when compared to traditional waterfall-style methods. The most significant aspect of agile approaches is that they all emphasize allowing people to communicate and make decisions together in a timely and productive manner.

Initially, agile teams were mostly composed of developers. As these agile teams got increasingly productive and efficient at developing software, it became evident that having separate teams for quality assurance (QA) and development (dev) was inefficient. Agile expanded to include QA in order to boost the velocity of providing software, and it is now expanding to include delivery and support staff in order to extend agility from conception through delivery.

DevOps ideas enhance agile development approaches by further simplifying software change movement through the build, verify, deploy, and delivery stages, while also empowering cross-functional teams with complete ownership of software programs – from design to production support.

DevOps is an IT philosophy that promotes communication, collaboration, integration, and automation among software developers and IT operations in order to enhance software delivery speed and quality.

DevOps teams strive to standardize development environments and automate delivery processes in order to increase delivery predictability, efficiency, security, and maintainability. DevOps ideas give developers more control over the production environment as well as a better grasp of the production infrastructure. DevOps promotes giving teams the freedom to build, validate, distribute, and support their own applications. Nothing is "thrown over the wall" with DevOps.

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