This document defines and compares different types of quadrilaterals including parallelograms, rhombuses, squares, trapezoids, and rectangles. It provides properties for each shape, such as opposite sides being equal and parallel for parallelograms, all sides being equal for rhombuses and squares, trapezoids having only one set of parallel sides, and rectangles having right angles and equal diagonals. The document outlines key distinguishing features of common quadrilaterals.