The expression "3x4" represents a multiplication problem where the number 3 is multiplied by the number 4. In mathematical terms, this means adding the number 3 a total of 4 times. The result of this multiplication is 12, which is the product of the two numbers. In practical applications, "3x4" can be seen in various contexts, such as calculating the area of a rectangle. If a rectangle has a width of 3 units and a height of 4 units, its area can be found using the formula Area = Width x Height, resulting in an area of 12 square units.