Shell: Command-Line Interface for Operating Systems

A shell is a command-line interface that allows a user to interact with an operating system by typing commands. It's a program acting as a user interface to access the services provided by the operating system. The shell interprets the commands entered by the user and executes them on the system. It provides a way to navigate the file system, run programs, and manage system resources. Common shells include Bash, PowerShell, and Zsh.