A polygon is a two-dimensional geometric figure that has a finite number of straight sides or line segments connected to each other end to end to form a closed shape. The line segments of a polygon are called its edges or sides, and the points where two sides meet are called vertices or corners. The angles formed by the intersection of two sides of a polygon are called interior angles.

Some key points about polygons are:

• A polygon is a closed shape made up of line segments in a two-dimensional plane.
• The sides of a polygon are straight line segments connected to each other end to end.
• The points where two sides meet are called vertices or corners.
• A polygon can be named based on the number of sides it has, such as a triangle (3 sides), a quadrilateral (4 sides), a pentagon (5 sides), a hexagon (6 sides), and so on.
• A polygon can be classified as simple or complex. A simple polygon is one that does not intersect itself, while a complex polygon intersects itself.
• A polygon can be classified as convex or concave. A convex polygon has all its interior angles less than 180 degrees, while a concave polygon has at least one interior angle greater than 180 degrees.

It is important to note that a circle is not considered a polygon because it is a curved shape and does not have straight sides or angles.