Zsh is an interactive shell that improves upon Bash. Oh-My-Zsh is a configuration manager for Zsh that has a wide array of useful plugins. You can see the whole list on their website (https://github.com/robbyrussell/oh-my-zsh). For example, if you want powerful autocomplete and syntax highlighting functionality in your CLI, there are plugins such as zsh-autosuggestion and zsh-syntax-highlighting. You can install and configure Zsh and Oh-My-Zsh on macOS, Linux, and Windows. The Oh-My-Zsh page has installation instructions as well as a list of themes and plugins.