Hudson Lab's Jenkins is the most popular open-source continuous integration technology. It's cross-platform, meaning it can run on Windows, Linux, Mac OS, and Solaris. Jenkins is a Java application. Jenkin's main purpose is to keep track of any job, such as SVN (Apache Subversion) checkouts, cron JOBS, or application states. When a specific event in an application occurs, it triggers pre-configured actions.

Following are the features of Jenkins:

• Jenkins generates a list of all changes made in SVN repositories, for example.
• Jenkins gives permanent links to the most recent build or failed build, which can be utilised for convenient communication.
• Jenkins is simple to INSTALL using either a direct installation file (exe) or a war file for deployment via the application server.
• Jenkins can be set up to send the content of the build STATUS to an email address.
• Simple CONFIGURATION: Jenkins makes it simple to set up multiple tasks.
• Jenkins can be configured to run the automated test build on TestNg following every SVN build.
• Jenkins documents the details of the jar, its version, and the mapping of build and jar numbers.
• Plugins: Jenkins can be set to utilise features and additional functionality provided by third-party plugins.

Following are the reasons we use Jenkins with Selenium :

• When you run Selenium tests in Jenkins, you can run them every time your program changes, and when the tests pass, you may deploy the SOFTWARE to a new environment.
• Jenkins may execute your tests at a predetermined time.
• The execution history as well as the Test Reports can be saved.
• Jenkins allows you to develop and test a project in continuous integration using Maven.