Command-line tools are software programs that allow users to interact with their computer's operating system through text-based commands. Instead of using a graphical interface, users type commands into a terminal or command prompt to perform tasks such as file management, system monitoring, and software installation. These tools are often favored by developers and system administrators for their speed and efficiency. Many command-line tools are built into operating systems like Linux, macOS, and Windows. Examples include bash for scripting, git for version control, and curl for transferring data. Mastering these tools can enhance productivity and provide greater control over system operations.