This document discusses GitLab CI Packer and continuous integration/continuous deployment (CI/CD) practices. It contrasts the traditional "cascade" development model with shorter agile cycles. The key points are that automation, CI/CD for both applications and infrastructure, and a DevOps culture and tools can enable more frequent deployments. CI catches bugs early through automated builds and tests. CD aims for continuous deployment through techniques like blue/green, A/B testing, and canary releases. DevOps reduces team silos and focuses on business outcomes.