An Interactive Shell is a command-line interface that allows users to interact with the operating system or software in real-time. It enables users to enter commands and receive immediate feedback, making it easier to execute tasks, run scripts, and manage files. Common examples include the Bash Shell in Linux and the Command Prompt in Windows. These shells often support features like command history, auto-completion, and scripting capabilities, enhancing user efficiency. They are widely used by developers, system administrators, and power users for tasks ranging from simple file management to complex programming and system configuration.