A change in one of the angles so that it is no longer 90 degrees. (assuming the vertices are all free to rotate but not slide).
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It is a right angled parallelogram.
A quadrilateral and a rectangle are the same so.............
A rectangle is a parallelogram but a parallelogram is not a rectangle. A rectangle needs all 90 degree angles but a parallelogram dosnt.
A rectangle is a parallelogram but a parallelogram need not be a rectangle and so they are not the same.
A rectangle is defined as "a parallelogram with one right angle" A parallelogram is defined as "a quadrilateral with opposite sides equal and parallel" This makes a rectangle a sort of second-generation quadrilateral!