The sum of $2 + 2 = 4$.

Would you like more details or have any questions?

Here are five related questions to explore:

1. What is $2 \times 2$?
2. What is $2^2$ (2 squared)?
3. If you subtract 2 from 4, what do you get?
4. What is $2 + 2 \times 2$ using the order of operations?
5. How can you express $2 + 2$ using repeated addition?

Tip: In math, always follow the order of operations (PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction) to solve more complex expressions correctly.