Opensource.com - https://opensource.com/article/18/2/devops-delivers-cool-apps-users
A long time ago, in a galaxy far, far away, before DevOps became a mainstream practice, the software development process was excruciatingly slow, tedious, and methodical. By the time an application was ready to be deployed, a ginormous laundry list of changes and fixes to the next major release had already amassed. It took months to go back and work through the entire development cycle to prepare for each new release. Keep in mind that this process would be repeated again and again to deliver updates to users.