CI/CD is the practice of automating the integration, testing, and delivery of software so that changes reach production quickly, frequently, and reliably. The acronym combines two complementary disciplines: continuous integration (CI) and continuous delivery or deployment (CD). Together they form the backbone of any modern DevOps team.
What does CI/CD mean?
CI/CD describes an automated pipeline that takes every code change and moves it, step by step, from the repository to production. Instead of accumulating changes for weeks and deploying them in one large, risky event, teams integrate and release in small, constant batches.
Continuous integration (CI)
Continuous integration means merging everyone’s work into a shared repository several times a day. Each merge triggers an automated build and a battery of tests that verify the change works. If a test fails, the team knows in minutes, not weeks.
Continuous delivery and deployment (CD)
The term CD covers two complementary levels:
- Continuous delivery: every change that passes the tests is ready for production with a single approval step.
- Continuous deployment: the approved change reaches production fully automatically, with no manual intervention.
The difference is the final step: in continuous delivery a person decides when to publish; in continuous deployment, the pipeline publishes on its own.
CI vs CD: the difference in one table
| Continuous integration (CI) | Continuous delivery/deployment (CD) | |
|---|---|---|
| What it automates | Build and tests on every change | Publishing to environments and production |
| Question it answers | Is the change correct? | Is the change ready for users? |
| Result | Integrated, verified code | A deployable or deployed version |
How a CI/CD pipeline works step by step
- Commit: a developer pushes a change to the repository.
- Build: the pipeline compiles the application in a clean, reproducible environment.
- Tests: unit, integration, and security tests run.
- Artifact: if everything passes, a versioned artifact is produced (a container image, a package, etc.).
- Deploy to staging: the artifact is published to a test environment identical to production.
- Approval or automatic deployment: depending on the model, a person approves or the pipeline publishes on its own.
- Monitoring: after the deployment, observability confirms that everything operates normally.
Business benefits of CI/CD
- Sustainable speed: releasing in small batches reduces the risk of each deployment and accelerates time to market.
- Measurable quality: automated tests catch errors before they reach the user.
- Traceability: every version is recorded, which makes audits and compliance easier.
- Focused teams: automation frees people from repetitive tasks so they can create value.
CI/CD on AWS
AWS offers managed services to build end-to-end pipelines:
- AWS CodePipeline orchestrates the pipeline stages.
- AWS CodeBuild builds and runs the tests.
- AWS CodeDeploy automates deployments.
Many teams combine these services with tools like GitHub Actions, GitLab CI, or Jenkins, running the runners on AWS infrastructure to keep control of cost and security. When workloads run in containers, the pipeline publishes to Amazon EKS or ECS.
CI/CD, DevOps, and security
CI/CD is the mechanism that makes DevOps possible. The natural next step is to integrate security into the pipeline: that is the move from DevOps to DevSecOps, where vulnerability and dependency scanning become a mandatory build step.
How to adopt CI/CD with good practices
- Start with a pilot pipeline on a representative service and expand wave by wave.
- Keep builds fast: a slow pipeline discourages its use.
- Version the pipeline configuration alongside the code (pipeline as code).
- Define clear quality and security thresholds that block the build when needed.
At Caleidos we design and implement CI/CD pipelines on AWS as part of our DevOps practice, with production cases documented in our case studies.
Frequently asked questions
What does CI/CD mean? CI is continuous integration and CD is continuous delivery or deployment. Together they automate the path of code from the repository to production.
What is the difference between CI and CD? CI automates the build and tests for every change; CD automates publishing to environments and production.
Is CI/CD the same as DevOps? No: DevOps is the culture and operating model; CI/CD is the technical practice that makes it possible.
What tools are used on AWS? AWS CodePipeline, CodeBuild, and CodeDeploy, often combined with GitHub Actions, GitLab CI, or Jenkins on AWS infrastructure.
Want to bring CI/CD to your operation?
Let’s talk about your current pipeline and we’ll give you a concrete recommendation on where to start.
