They are called Quadrilaterals. The 'Quad' means 4
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Improved Answer:-
Shapes which have 4 sides are quadrilaterals such as a square, a rectangle, a rhombus, a parallelogram ..... etc
as shape with four sides is generally a squre but a group of shapes with four sides are called quadrelaterals
Well If you are looking for a four sided shape with no parallel sides it is called a trapezium.
There are many such shapes and there is no specific name.
A Square
Shapes with straight sides are called polygons