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What is DevOps?

Many people have their opinions on DevOps?  It is doing Continuous Itegration or Continuous Delivery or using Chef, Team City or even the cloud.  While these all maybe tools for improving DevOps, I don't see this as DevOps.

I see DevOps as the realization that software development does not start at writing code or end with code check in, DevOps is continuously improving everything from customer request to customer saying "Thank You" for a new working feature.  

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