What Is CI/CD?
CI/CD is the practice of automatically building, testing, and deploying code every time a change is pushed. It replaces manual, error-prone release processes with a repeatable pipeline that catches bugs early and ships faster.
Teams with mature CI/CD pipelines deploy multiple times per day with lower failure rates than teams that release manually on a fixed schedule.
CI vs CD
Continuous Integration focuses on merging and verifying code frequently. Continuous Delivery (and Deployment) extends that to automatically prepare — or push — every green build to production.
| Continuous Integration (CI) | Continuous Delivery/Deployment (CD) |
|---|---|
| Runs on every push / PR | Runs after CI passes |
| Lint, test, build | Package, release, deploy |
| Fast feedback to developers | Fast delivery to users |
| Detects merge conflicts early | Eliminates manual release steps |
| Outcome: a verified artifact | Outcome: a live deployment |
Pipeline Stages
A typical pipeline moves through four gates. Each gate must pass before the next starts — a failure stops the pipeline and notifies the team immediately.
Popular Tools
Best Practices
Cache dependencies between runs. Parallelise independent jobs. A pipeline longer than 10 minutes discourages frequent commits.
Run the cheapest checks first (lint before tests, tests before build). Send notifications to the author — not a shared channel — so fixes happen immediately.
Never hardcode credentials in pipeline files. Use your platform's secret store (GitHub Secrets, GitLab CI Variables) and rotate them regularly.