🔧 What is Jenkins?

Jenkins is an open-source automation server used to implement Continuous Integration (CI) and Continuous Delivery/Deployment (CD). It helps developers automate the process of building, testing, and deploying code.

🧩 Key Concepts

✅ Continuous Integration (CI)

• Developers regularly commit code to a shared repository.
• Jenkins automatically builds and tests code after each commit.
• Helps catch bugs early and ensures code stability.

🚀 Continuous Delivery/Deployment (CD)

• Once the code is tested successfully, Jenkins can automatically deploy it to staging or production environments.
• Ensures faster and more reliable releases.

⚙️ How Jenkins Works

1. Source Code Management (SCM): Connects to GitHub, GitLab, Bitbucket, etc.
2. Build Triggers: Automatically runs when code is pushed, on a schedule, or manually triggered.
3. Build Pipeline: Executes a series of steps (build, test, deploy).
4. Plugins: 1000+ plugins to integrate with tools like Docker, Kubernetes, Maven, Slack, etc.

📦 Jenkins Pipeline (Scripted or Declarative)

A pipeline defines your CI/CD process as code (Jenkinsfile), example: