A Freestyle job is a generic job type in Jenkins that allows you to customize the build process. It is a free-form job type that allows you to do whatever you need to do to build your project. It does not have any particular structure or restriction on how you configure the build process.
Example: A Freestyle job might be used to compile a Java project and deploy the compiled code to a web server.
A Pipeline job is a special type of job in Jenkins that allows you to define a continuous delivery pipeline as code. It is a structured job type that requires you to define the steps of your build process in a specific format. It also allows you to define parameters, triggers, and other advanced features that are not available in a Freestyle job.
Example: A Pipeline job might be used to build a Docker image, push it to a registry, and deploy it to a Kubernetes cluster.