The Digital Root of a number is the single-digit value obtained by repeatedly summing the digits of the number until only one digit remains. For example, to find the digital root of 987, you would add 9 + 8 + 7 to get 24, and then add 2 + 4 to get 6. This process can be useful in various mathematical applications, including checks for divisibility. Digital roots can also be calculated using a shortcut known as the modulus operation. Specifically, the digital root can be found by taking a number and finding its remainder when divided by 9. If the result is 0, the digital root is 9, except for the number 0 itself, which has a digital root of 0.