An assembly line with quality checks
Day 18 of 149
👉 Full deep-dive with code examples
The Factory Assembly Line
Imagine a car factory:
- Parts assembled → Build
- Quality inspector checks → Test
- If passes, sent to dealership → Deploy
If anything fails, the line stops. No cars shipped with known defects!
CI/CD is an assembly line for code.
CI = Continuous Integration
When a developer pushes code (often on every push or pull request):
New Code → Automatic Build → Automatic Tests
↓
Pass? ✅ → Ready for review
Fail? ❌ → Developer notified
Continuous = Happens automatically and frequently (based on the triggers you set)
Integration = Regularly combining the team's changes (often by merging into a shared branch)
Catches bugs before they spread!
CD = Continuous Deployment
After code passes tests:
Tests Pass → Deploy to Staging → All good?
↓
Deploy to Production!
Code can go live with little or no manual work, depending on how it's set up.
Or Continuous Delivery: It's kept ready to deploy, but a human clicks "Deploy" (or approves) at the end.
Why It Matters
Without CI/CD:
- Developer works for weeks
- Tries to deploy
- Everything breaks
- "It worked on my machine!" 😱
- Takes days to fix
With CI/CD:
- Small changes, tested immediately
- Bugs caught in minutes
- Can deploy many times per day
- Usually easier to see what broke and when
In One Sentence
CI/CD uses automation to build, test, and (often) deploy your code so bugs are caught early and releases are fast.
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