Pyinfra is a Python-native, agentless automation tool that runs commands over SSH, allowing for concurrent, idempotent, and fast execution. It is designed to be a configuration management tool, similar to Ansible, but uses Python as a declaration language instead of YAML. Pyinfra can be used for deploying and managing infrastructure, and it integrates with Terraform for inventory management. The tool is designed to be scalable, hackable, and easy to use.