A polygon is a closed, two-dimensional (2D) geometric figure made up of straight line segments connected end to end. These line segments are called sides or edges, and the points where two sides meet are called vertices or corners. A polygon must have at least three sides and three angles, and it cannot have any curved sides or open ends

. Polygons are classified based on the number of sides they have, such as triangles (3 sides), quadrilaterals (4 sides), pentagons (5 sides), hexagons (6 sides), and so on. They can also be categorized by their properties:

• Regular polygons have all sides and all angles equal.
• Irregular polygons do not have all sides and angles equal.
• Convex polygons have all interior angles less than 180°, with no indentations.
• Concave polygons have at least one interior angle greater than 180°, creating a "cave" or indentation.
• Simple polygons have sides that do not intersect except at vertices, while complex polygons have self-intersecting sides

In summary, polygons are flat shapes with straight sides forming a closed loop, and they are fundamental shapes in geometry with various types and properties based on their sides and angles