they have 4 sides
not all congruent
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It would be a concave quadrilateral The link below has some pics.
It is a 4 sided quadrilateral with a pair of opposite parallel sides of different lengths and its 4 interior angles add up to 360 degrees
It is a 4 equal sided quadrilateral It has 2 equal opposite acute and 2 equal opposite obtuse angle Its opposite sides are parallel
A trapezoid is known in the developed world as a trapezium. It is a quadrilateral which has one pair of parallel sides and another pair which is not parallel. There are many other attributes which can be derived from these.
For the same reason that a cat is an animal but an animal is not always a cat. Because a trapezoid is a special kind of quadrilateral. A quadrilateral is anything with four sides. A trapezoid has four sides, and also two of them are parallel to each other. Therefore some quadrilaterals are trapezoids, but most of them aren't.