## TL;DR

CI/CD automates software delivery: Continuous Integration (merge frequently, auto-test), Continuous Delivery (auto-deploy to staging), Continuous Deployment (auto-deploy to production). Core principle: every commit triggers pipeline → build → test → deploy. Reduces integration pain and speeds feedback loops.

## Core Explanation

CI: automated builds + tests on every commit. CD: automated deployment after tests pass. Pipeline stages: lint, build, unit test, integration test, security scan, deploy to staging, smoke test, deploy to production. Tools: GitHub Actions, GitLab CI, Jenkins, CircleCI. Canary deployments: roll out to subset, monitor, expand. Blue-green: two identical environments, swap traffic.

## Further Reading

- [Continuous Delivery (Jez Humble, David Farley)](https://www.oreilly.com/library/view/continuous-delivery-reliable/9780321670250/)