The shape that has four congruent sides and two sets of parallel sides is a square.
A square is defined as a quadrilateral (a four-sided figure) with all sides of equal length and all interior angles equal to 90 degrees. The property of having two sets of parallel sides is also characteristic of rectangles, but in a square, since all sides are congruent, it is a specific type of rectangle.
In summary, the square is the only shape that meets both criteria of having four equal sides and two pairs of parallel sides, making it a unique and fundamental shape in geometry.