A polygon which non adjacent sides do not intersect. An example of a simple polygon is the following image.
A polygon that is not simple is named a complex polygon. An example of a complex polygon.
A polygon in which all the interior angles measure less than $$180^\circ$$. All the apexes point towards the exterior of the polygon. We can see an example:
A polygon that does not satisfy the conditions needed to be classified as convex is named a concave polygon.
A polygon in which all the sides have the same length and all the interior angles measure the same. All the polygons listed in the table of regular polygons are examples of this type of polygon. Let's see a heptagon:
The polygon that is not regular is called irregular polygon.