What is a quadrilateral that is characterized by opposite sides that are congruent and opposite angles that are congruent?

A quadrilateral characterized by opposite sides that are congruent and opposite angles that are congruent is a parallelogram. In a parallelogram, both pairs of opposite sides are equal in length, and both pairs of opposite angles are equal in measure. Common examples of parallelograms include rectangles, rhombuses, and squares, which also have additional properties.