What shapes have both pairs of opposite sides congruent?

Shapes that have both pairs of opposite sides congruent include rectangles, parallelograms, rhombuses, and squares. In these shapes, not only are the opposite sides equal in length, but they also exhibit specific properties depending on their classification. For example, all squares are rectangles and rhombuses, but not all rectangles or rhombuses are squares. These properties contribute to the overall symmetry and balance in each shape.