The AWS CLI (Amazon Web Services Command Line Interface) is a tool that allows users to manage their AWS services through command-line commands. It provides a unified way to interact with various AWS services, enabling users to automate tasks and manage resources efficiently without needing to use the web-based console. With the AWS CLI, users can perform actions such as launching instances, managing storage, and configuring security settings directly from their terminal or command prompt. This tool is particularly useful for developers and system administrators who prefer scripting and automation to streamline their workflows in the AWS cloud environment.