Prezto is a configuration framework for the Zsh shell, designed to enhance the user experience by providing a set of plugins and themes. It simplifies the process of managing shell configurations, making it easier for users to customize their terminal environment. With Prezto, users can quickly enable or disable features, access useful commands, and improve their productivity. It is built on the principles of speed and simplicity, allowing users to focus on their tasks without getting bogged down by complex configurations.