It can, but it need not.
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It can have 2 parallel sides, but it need not have any.
Any even-sided, regular shape will have opposite sides parallel. A square, hexagon, octagon and decagon are just four examples !
A rhombic octagon. An ordinary regular octagon does have perpendicular sides. They do not meet in the outline of the octagon because they are alternate, but they are still perpendicular. However, in the same way that a rhombus is a distorted square, a rhombic octagon can have 4 pairs of parallel sides but no perpendicular ones.
Any polygon with four or more sides can have parallel sides.
An octagon had four pairs of parallel lines.