It is a rhombus - of which, a square is a special case.
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A rhombus is a quadrilateral with 4 equal sides and if the angles are also all equal that that rhombus is a square.
square
A rhombus is a quadrilateral with four equal sides.
All sides equal but not all angles.
The only quadrilaterals that have all sides an equal length are a square abd a rhombus.