Final answer:
In the context of hacking the box, a 'cube' is used for Brute-force password cracking, which is the systematic trial of every possible password combination.
Step-by-step explanation:
According to the Network Chuck video, a "cube" in the context of hacking the box is used for Brute-force password cracking. This method involves systematically attempting every possible combination of characters until the correct password is found. It is an effective but time-consuming approach to gain unauthorized access to accounts or systems by figuring out passwords. These cubes are specialized pieces of hardware or software designed to perform these calculations at a high speed. However, due to increased security measures like complex password policies and two-factor authentication, brute-force attacks are becoming more difficult to carry out successfully.