A "Perfect Square" is a number that can be expressed as the product of an integer multiplied by itself. For example, the number 9 is a perfect square because it can be written as 3 × 3. Other examples include 1 (1 × 1), 4 (2 × 2), and 16 (4 × 4). Perfect squares are important in mathematics, particularly in algebra and geometry. Perfect squares can also be visualized as geometric shapes. For instance, if you have a square with sides of length n, the area of that square is n², which is a perfect square. This concept helps in understanding the relationship between numbers and shapes, making it easier to grasp mathematical principles.