"A+B" is a simple mathematical expression representing the addition of two values, A and B. In this context, A and B can be any numbers, such as integers, fractions, or decimals. The result of this operation is called the sum, which is obtained by combining the two values. In practical terms, if A equals 3 and B equals 5, then "A+B" equals 8. This basic arithmetic operation is foundational in mathematics and is used in various fields, including science, finance, and everyday problem-solving. Understanding "A+B" is essential for more complex mathematical concepts.