What Is CI/CD?

What Is CI/CD?

From Manual Deploys to Automated Pipelines

In the past, integration and deployment were manual, slow, and scary. Developers worked on branches for weeks, merged everything at once, and discovered conflicts and broken tests during the release. CI/CD replaces those rituals with automated processes that run continuously.

Continuous Integration

Continuous Integration (CI) means every change a developer pushes is merged and verified frequently - often several times a day. A CI pipeline automatically runs builds, tests, and static checks on each commit. If a change breaks something, the pipeline fails and the team learns immediately, while the change is still small and understandable.

The benefits compound: problems surface quickly, code is always in a working state, and merging is routine instead of agonizing.

Continuous Delivery and Deployment

Continuous Delivery (CD) extends CI by automating everything needed to release, so a version can go to production with one approval. Continuous Deployment removes even that manual step: every passing change ships to production automatically.

The difference is the human gate. Delivery stops for a click; deployment does not. Teams choose where to draw the line based on risk tolerance.

The Pipeline Shape

A pipeline is a sequence of stages. A typical one looks like this:

commit -> build -> test -> package -> publish -> deploy

Each stage consumes the previous stage's output. Building compiles code and creates artifacts, testing validates behavior, packaging produces a deployable image or package, publishing stores it in a registry, and deploy pushes it to an environment.

Why Teams Adopt It

CI/CD removes fear from shipping. Small changes reach users within minutes or hours instead of months, rollbacks become routine because releases are frequent and small, and humans are freed from repetitive chores to do real work. The practices you will learn next - GitHub Actions, Docker, and automated testing - are the machinery behind automated pipelines.

Key Points

• CI merges and verifies every change automatically on each commit.
• CD automates release steps; continuous deployment removes the human gate.
• A pipeline runs build, test, package, publish, and deploy stages.
• CI/CD surfaces problems when changes are small and fresh.
• Frequent, small releases make rollbacks simple and cheap.