Shell Configuration refers to the settings and preferences that define how a command-line interface, or shell, behaves. This includes aspects like the appearance of the prompt, the command history, and the environment variables that affect the execution of commands. Users can customize their shell to improve efficiency and usability. Common shells include Bash, Zsh, and Fish, each offering unique features and configuration options. Configuration files, such as `.bashrc` for Bash or `.zshrc` for Zsh, allow users to set up aliases, functions, and other personalized settings that enhance their command-line experience.