The document defines and compares different types of quadrilaterals. A quadrilateral is a closed shape with four sides whose interior angles sum to 360 degrees. The main quadrilaterals discussed are: parallelograms, which have opposite sides that are parallel and equal; rectangles, which have four right angles; rhombi, which have four equal sides; squares, which are rhombi with four right angles; kites, which have two pairs of equal sides that meet at a right angle; and trapezoids, which have one set of parallel sides. Key differences between kites, squares, rhombi and parallelograms are outlined.