The expression "3 + 2" represents a simple addition problem in mathematics. In this case, the number 3 is combined with the number 2 to find a total. Addition is one of the basic operations in arithmetic, which is a branch of mathematics dealing with numbers and their relationships. When you add 3 and 2, you count up from 3 by 2 more. This results in a total of 5. Therefore, the solution to the equation "3 + 2" is 5, which can also be visualized using objects, such as 3 apples and 2 more apples, resulting in 5 apples altogether.