DevOps is the union of people, process, and products to enable continuous delivery of value to our end users. (Microsoft)

Agile planning
Ensure a prioritized backlog of work is available for the team and facilitate management for work including user stories, bugs, and more
Continuous Integration (CI)
The process of automating the build and testing of code every time a team member commits changes to version control
Continuous Delivery (CD)
The process to build, test, configure, and deploy from a build to a production environment.
Monitoring
Use telemetry to deliver information about an application’s performance and usage patterns to aid learning as we iterate.