The **CI/CD pipeline** is a crucial part of DevOps operations. It automates steps in the software delivery process, such as: 
- initiating code builds 
- running automated tests
- deploying to a staging or production environment 

Automated pipelines remove manual errors, provide standardized development feedback loops, and enable fast product iterations. 

A basic CI/CD pipeline process works like
this:

# Pipelines in Jenkins
In the traditional Jenkins, we created pipelines using "freestyle jobs" with the help of GUI. These freestyle jobs were replaced with the `Jenkinsfile`, which defined the pipeline in Jenkins-specific, Groovy-based, domain-specific language (DSL). The **Groovy-based pipeline** came with its own set of challenges. Therefore, it was later replaced with the **declarative pipeline**. The declarative pipeline format is a simplified way to write `Jenkinsfile` definitions. To distinguish one from the other, we call the older pipeline syntax a **scripted pipeline**, and the newer syntax a **declarative pipeline**. 

# Pipeline in Jenkins X

In Jenkins X, pipelines are defined in the YAML format in the file `jenkins-x.yml`. **YAML** is the golden standard for having any type of configurations and definitions, including Kubernetes. An example of a Jenkins X pipeline is given below.

extends:
  import: classic
  file: pipeline.yaml
agent:
  label: jenkins-go
  container: gcr.io/jenkinsxio/builder-go
pipelines:
  release:
    build:
      steps:
        - dir: env
          steps:
            - sh: jx step helm apply
              name: helm-apply

  pullRequest:
    build:
      steps:
        - dir: env
          steps:
            - sh: jx step helm build
              name: helm-build

What is a Jenkins pipeline?

The CI/CD pipeline is a crucial part of DevOps operations. It automates steps in the software delivery process, such as:  initiating code builds running automated tests deploying to a staging or production environment  Automated pipelines remove manual errors, provide standardized development feedback loops, and enable fast product iterations. A basic CI/CD pipeline process works like this: 