They are basically the same thing however, a rhombus has the sides all congruent and the parallelogram has the opposite sides congruent.
If the rhombus had angles of 90 degrees it would become a square and if a parallelogram had sides 90 degrees it would become a rectangle.
All rhombuses are parallelograms, but not all parallelograms are rhombuses. Likewise, using the above example of squares, all squares are rectangles but not all rectangles are squares.
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Adjacent sides of a parallelogram can be of different lengths.
A rhombus is a parallelogram, but a parallelogram isn't always a rhombus. A rhombus is a parallelogram where all the lines are the same length.
A rhombus is a parallelogram, but something that is a parallelogram isn't necessarily a rhombus.
a parallelogram will never ever be a rhombus
A rhombus is always a parallelogram, by definition.