There are an infinite number of shapes that have two or more parallel opposite sides - any even-numbered polygon (hexagons, octagons, decagons, and so on).
A quadrilateral with only 1 set of parallel sides is a trapezoid (UK trapezium).
A parallelogram has two sets of parallel opposite sides. These would include rhombi and rectangles (and the special case of rectangles which are squares).
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The opposite sides of a parallelogram are parallel
This is a parallelogram if it has 4 sides
A parallelogram is a 4 sided quadrilateral and its opposite sides are parallel to each other.
A parallelogram has opposite equal parallel sides
In a parallelogram opposite sides are parallel to each other.