The "SharkJack" is a portable hacking device that can be used to test network security. It is described as being powerful and fast, with features that allow users to quickly scan networks, assess device activity, and potentially gain access to sensitive information. The device is also equipped with a USB-C charging port and an RGB LED that provides visual feedback on its activity. The video highlights the SharkJack's capabilities, emphasizing its ability to execute commands, collect information, and establish remote connections.