Ans: Octagon is a geometrical shape having eight sides. It has different types depending on different factors. Considering the length of the sides, octagons are of two types- regular and irregular. An octagon having eight equal-length sides is called a regular octagon. If the length of all the sides of the octagon is not equal, it is an irregular octagon. On the other hand, octagons are of two types depending on the pointing of angles- convex and concave octagons. If all the angles of an octagon are pointing towards out, it is called a convex octagon. If any of the angles of an octagon points inwards, it is a concave octagon.