The primary difference between a square and a rhombus is a square has four 90-degree angles, while a rhombus does not have any right angles. The sides of a square are perpendicular to one another, unlike the sides of a rhombus.
All the angles of a square are equal. The rhombus has two sets of opposite internal angles with the same measurement.
Both the square and rhombus are quadrilaterals and parallelograms—they have four sides, and their opposite sides are parallel. The two shapes have all sides equal. Every square, by definition, is considered a rhombus, but a rhombus is not always a square.