1. The problem is to find the value of $1 - 1$. 2. The subtraction operation means we take away the second number from the first number. 3. Using the formula for subtraction: $$a - b = c$$ where $a=1$ and $b=1$. 4. Substitute the values: $$1 - 1 = c$$. 5. Calculate the result: $$1 - 1 = 0$$. 6. Therefore, the answer is $0$.