The device commonly used to perform input tasks on a computer is the keyboard. This peripheral consists of keys that allow users to enter data, execute commands, and control various functions. Alongside the keyboard, the mouse is another popular input device that enables point-and-click interaction. While touchscreens are increasingly common in devices such as tablets and smartphones, the keyboard remains the primary tool for typing and executing shortcuts, especially in professional and creative environments. Overall, input devices like keyboards and mice are crucial for effective user interaction with computers.