The result of $0 + 4 = 4$.

Would you like more details or have any questions?

Here are 5 related questions to expand your understanding:

1. What is the result of $4 + 5$?
2. What happens when you add a negative number to zero?
3. How does adding zero to any number affect the result?
4. Can you subtract zero from a number? What is the result?
5. What is the result of $4 + (-4)$?

Tip: Adding zero to any number always keeps the original number unchanged.