This document provides an overview of different types of quadrilaterals. It defines a quadrilateral as a closed figure with four straight sides. It then describes and provides visual examples of six specific types of quadrilaterals: square, rectangle, parallelogram, rhombus, trapezoid, and irregular quadrilateral. For each shape, it indicates the defining characteristics, such as equal sides or right angles. The purpose is to explain the different quadrilaterals and how they are classified based on their geometric properties.