A rhombus is a type of polygon that belongs to the family of quadrilaterals. Specifically, a rhombus is defined as a four-sided figure (quadrilateral) where all sides are of equal length. However, not all rhombuses are squares.
A rhombus that is not a square maintains the property that all sides are equal, but the angles between those sides are not necessarily 90 degrees, which is a requirement for a square. In a non-square rhombus, adjacent angles can be acute (less than 90 degrees) or obtuse (greater than 90 degrees), while the opposite angles remain equal.
To visualize, imagine a diamond shape. If you draw this diamond with all sides equal but the angles at the top and bottom are sharper than the angles on the sides, you have a rhombus that isn’t a square. In essence, every square is a rhombus (because it has equal sides), but not every rhombus qualifies as a square due to its angles.