The expression "3 + 4" represents a simple addition problem in mathematics. In this case, the number 3 is combined with the number 4 to find the total. Addition is one of the basic arithmetic operations used to calculate the sum of two or more numbers. When you add 3 and 4, you count up from 3 four more steps: 4, 5, 6, and finally 7. Therefore, the result of "3 + 4" is 7. This concept is fundamental in math and is often one of the first operations taught to children.