1. **State the problem:** Calculate the sum of 4 and 4. 2. **Formula used:** Addition of two numbers is given by $a + b$. 3. **Apply the formula:** Here, $a = 4$ and $b = 4$, so we calculate $4 + 4$. 4. **Perform the addition:** $4 + 4 = 8$. 5. **Conclusion:** The sum of 4 and 4 is 8.