The Puppet Forge is a repository of modules and manifests that can be used to automate the configuration and management of systems. It is used to share, find, and reuse code that has been created by the Puppet community.
For example, if a user wants to install a web server, they can search the Puppet Forge for a module that automates the installation and configuration of the web server. The user can then install the module on their system and use it to quickly and easily get the web server up and running.