The expression "4x3" represents a mathematical operation known as multiplication. In this case, it means that the number 4 is being multiplied by the number 3. The result of this operation is 12, which is the total amount obtained when you add 4 three times (4 + 4 + 4) or 3 four times (3 + 3 + 3 + 3). Multiplication is one of the four basic arithmetic operations, along with addition, subtraction, and division. It is often used in various fields, including science, engineering, and everyday calculations, to simplify the process of adding equal groups together. Understanding multiplication is essential for solving more complex mathematical problems.