CI/CD (Continuous Integration / Continuous Deployment)
CI/CD is a set of practices that automate code testing, building, and deployment, allowing development teams to deliver changes to production quickly, reliably, and with fewer errors.
CI/CD stands for Continuous Integration and Continuous Deployment (or Continuous Delivery). Together, they automate the process of getting code changes from a developer's computer to a live production environment. Continuous Integration (CI) is the practice of automatically testing and building code every time a developer pushes changes.
If anything fails, the team is notified immediately, before the broken code can cause problems. Continuous Deployment (CD) takes it further by automatically deploying code to production after it passes all tests. Continuous Delivery is a slightly more conservative approach where the deployment is prepared automatically but requires manual approval before going live.
In practice
- A SaaS company deploys code to production an average of 12 times per day through their CI/CD pipeline, each deployment taking under 5 minutes from merge to live
- An e-commerce platform's CI pipeline catches 95% of bugs before they reach production by running 2,000 automated tests on every code change
- A startup uses Vercel for automatic deployments: every pull request creates a preview URL that stakeholders can review before changes go live
- A development team reduced their deployment time from a stressful 4-hour manual process to a 3-minute automated pipeline, eliminating human error in deployments
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