The expression "1 + 1" represents a basic arithmetic operation known as addition. In this case, it combines the number 1 with another 1. The result of this operation is 2, which is the sum of the two numbers. Addition is one of the fundamental operations in mathematics, used to calculate totals and combine quantities. The concept of adding 1 to 1 is often one of the first lessons taught in early education, helping to build a foundation for more complex mathematical concepts in the future.