What is a difference between a square and a trapezoid?
A square has 4 sides but a trapezoid does not.
A trapezoid is a quadrilateral but a square is not.
A trapezoid must have 4 angles but a square does not.
A square must have 2 pairs of parallel sides but a trapezoid does not.

Answer

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Answer

\boxed{\text{A square must have 2 pairs of parallel sides but a trapezoid does not.}}

Steps

Step 1 ：A square is a quadrilateral with all sides equal and all angles equal to 90 degrees: $4$ sides, $4$ angles, and $2$ pairs of parallel sides.

Step 2 ：A trapezoid is a quadrilateral with at least one pair of parallel sides: $4$ sides, $4$ angles, and $1$ pair of parallel sides.

Step 3 ：\boxed{\text{A square must have 2 pairs of parallel sides but a trapezoid does not.}}