A rubber ducky is a hacker device that can be used to breach a system and steal data. The device is a USB stick that instructs the computer that it attaches to that it is a Human Interface Device (HID), such as a keyboard or a mouse. This is a method to access accounts on the Web, such as internet banking, that have their credentials stored in the browser. The scripts that implement automated instructions are written in a language called DuckyScript, which is very easy to learn.