Jenkins Declarative Pipeline

Jenkins Pipeline is a comprehensive set of plugins designed to facilitate the implementation and automation of continuous delivery and continuous integration (CI/CD) pipelines within Jenkins. A pipeline in Jenkins is a set of instructions for orchestrating software applications, building, testing, and deployment. It allows you to define the entire build process, from source code to deployment, as code in a script.

Jenkins Pipeline supports two main syntaxes for defining pipelines: Declarative and Scripted Pipeline.

Declarative Pipeline: Uses a structured, more human-readable syntax. Declarative pipelines define pipelines using a domain-specific language (DSL) with a predefined structure. This structure includes stages, steps, and other key elements that help define the Pipeline's flow. Declarative pipelines are typically written in a Jenkinsfile, a text file describing the entire build process. It is also easier to read and write, especially for simple use cases and standard build processes.

Example of a Declarative Pipeline:
```
 pipeline {
     agent any
     stages {
         stage('Build') {
             steps {
                 //
             }
         }
         stage('Test') {
             steps {
                 //
             }
         }
         stage('Deploy') {
             steps {
                 //
             }
         }
     }
 }
```
Scripted Pipeline: Uses a more flexible, Groovy-based scripting syntax and allows for more complex and dynamic build processes using Groovy scripting. Scripted Pipeline is suitable for advanced use cases requiring fine-grained control and flexibility. It requires more scripting knowledge compared to the Declarative Pipeline.

Example of a Scripted Pipeline:
```
 node {
     stage('Build') {
         // Code to build the project
     }
     stage('Test') {
         // Code to run tests
     }
     stage('Deploy') {
         // Code to deploy the application
     }
 }
```
Task-01

Create a New Job, this time select Pipeline instead of Freestyle Project.
Follow the Official Jenkins Hello world example
Complete the example using the Declarative pipeline

Console Output:

Now, to complete the example using a declarative pipeline

Jenkins Declarative Pipeline

Task-01