Puppet is an open source configuration management tool that automates the configuration of server and other IT infrastructure. Puppet helps system administrators to automate the configuration, deployment, and management of their IT infrastructure.

For example, if you need to install a web server on multiple servers, you can use Puppet to create a manifest file that will define the configuration of the web server. This manifest file can then be deployed to each server, ensuring that the web server is configured the same way on each server.

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