Final answer:
A square is a quadrilateral with 2 pairs of parallel sides and 4 sides that have equal length.
Step-by-step explanation:
The quadrilateral with 2 pairs of parallel sides and 4 sides that have equal length is a square.
A square is a special type of quadrilateral where all four sides are equal in length and all angles are right angles (90 degrees). Additionally, a square has two pairs of parallel sides.
For example, if you have a square with side length 5 units, all four sides will be 5 units long, and the opposite sides will be parallel to each other.