A square is a special shape in geometry that has four equal sides and four right angles. This means that each corner of a square measures 90 degrees. Because all sides are the same length, squares are often used in design and architecture, making them a common sight in buildings and furniture. In math, the area of a square can be found by multiplying the length of one side by itself. For example, if one side of a square is 3 units long, the area would be 3 x 3 = 9 square units. Squares are also important in art and can be seen in patterns and designs.