The sum of $3 + 4 = 7$.

Would you like more details or explanations on something else? Here are some related questions you might find interesting:

1. What are the properties of addition?
2. How does the commutative property of addition work?
3. What happens when you add negative numbers?
4. Can you explain the concept of integer addition?
5. How do you perform addition with decimals?

Tip: Remember that the order of addition does not change the result, thanks to the commutative property (e.g., $3 + 4 = 4 + 3$).