An octagon is a geometric shape that has eight sides and eight angles. The word "octagon" comes from the Greek words "okto," meaning eight, and "gonia," meaning angle. Regular octagons have equal sides and angles, while irregular octagons can have sides and angles of different lengths and measures. Octagons are commonly seen in everyday life, such as in stop signs, which are designed in this shape for easy recognition. The interior angles of a regular octagon add up to 1,080 degrees, with each angle measuring 135 degrees. This unique shape is also used in architecture and design.