Puppet is an open-source software configuration management tool used to automate the provisioning, configuration, and management of servers and infrastructure. Puppet uses a declarative language to define the desired state of systems, which it then enforces across multiple environments. By defining configurations as code, Puppet ensures consistency and repeatability, reducing the risk of human error and enabling efficient infrastructure management. Puppet supports a wide range of platforms and integrates with various DevOps tools, making it a popular choice for managing complex IT environments and facilitating continuous delivery and deployment practices.