CI
Abbreviation · Development · Origin: 2000
Definitions
CI, or Continuous Integration, is a software development practice where developers frequently merge their code changes into a shared repository, with each integration automatically triggering a build and test pipeline to detect errors as early as possible. The practice was formalized by Kent Beck as part of Extreme Programming and later championed by Martin Fowler. In a CI workflow, developers push code multiple times per day, and an automated server (Jenkins, GitHub Actions, GitLab CI, CircleCI) compiles the code, runs unit and integration tests, performs static analysis, and reports results within minutes. If any step fails, the team is notified immediately and fixes the issue before it compounds. CI prevents integration hell, where long-lived branches diverge so far that merging them becomes a days-long ordeal of resolving conflicts and debugging interactions. The practice requires a comprehensive automated test suite, a shared code repository, and team discipline around keeping the build green. CI is typically paired with Continuous Delivery or Continuous Deployment to form a complete CI/CD pipeline.
In plain English: The practice of automatically merging everyone's code changes into one shared copy several times a day and running tests each time, so problems are caught early instead of piling up.
The cultural aspect of CI is often overlooked: it requires developers to commit frequently (at least daily), write automated tests for every change, and fix broken builds immediately. The tooling is easy; the discipline is hard.
Example: 'CI isn't just Jenkins running your tests. It's a commitment to keeping the main branch always shippable. If the build is red, everything else stops.'
Source: cultural practice