The expression given in the image is:

$6 - | -4 |$

Step-by-step solution:

1. First, calculate the absolute value of $-4$. The absolute value of a number is its distance from zero on the number line, regardless of direction. So, $| -4 | = 4$.

2. Now substitute $| -4 |$ with $4$ in the expression: $6 - 4$

3. Perform the subtraction: $6 - 4 = 2$

The value of the expression is:

$\boxed{2}$

Would you like further explanation or details on this?

Here are 5 related questions:

1. What is the absolute value of a positive number, such as $|5|$?
2. How would you handle subtraction involving negative numbers, like $6 - (-4)$?
3. Can you explain how absolute values affect subtraction in other cases?
4. What is the result of the expression $8 - | -6 |$?
5. How do you apply the order of operations in expressions involving absolute values?

Tip: Always simplify absolute value terms first before performing other operations in an expression.