Shell: A User Interface for Operating Systems

In computer science, a shell is a program that provides a user interface for accessing an operating system's services. It's a command-line interface that allows users to interact with the operating system by typing commands. The shell interprets these commands and executes them, providing access to the file system, running programs, and managing system resources. There are many different shells available for different operating systems, including Bash, PowerShell, and Zsh.